Frequently Asked Questions

 

What is water pressure , bar and why would I need a pressure reducing valve?

Water supply network

The average water pressure is around 3 bar. The minimal water pressure your water company has to offer is 0.7. If that is the case you should have hydrofoor (a water pump)  installed to increase water pressure so the flow of water from your tap and shower is sufficient. A hydrofoor normally produces too much water pressure. So installing a pressure reducing valve set at 3 bar (optimal water pressure for all household appliances) is vitally important. Anything over 5 bar will damage your electrical appliances such as; the diswasher, electric water heater and your washing machine.

If you live in a house the water pressure downstairs will be higher than on the first floor. Besides that the water pressure can fluctuate per floor. For instance when you are using a lot of water in your kitchen the water pressure will fluctuate as a result of it. Logically you will have less water pressure in the bathroom on the first floor.

Electric water heater

Every water heater will have a maximum tank working pressure indicated in bar or mPa. This is the pressure building up inside the tank as a result of heating the water. So not the water pressure coming from your water mains.

Every single electric boiler (electric water heater) sold in the UK should comply with EU standards and is able to cope with a high water pressure for a short period of time. A boiler operating above the maximum working pressure for a longer period of time will get damaged. Therefore it is vitally important to use the right pressure relief valve. NEVER USE AN INCORRECT PRESSURE RELIEF VALVE. So please consult the manual of your electric water heater to find out what the maximum working pressure is for your product and use the supplied (or right) bar safety relief valve. The non-return valve inside the safety relief valve will prevent the water returning to the water mains from the electric water. So if you use an incorrect safety relief valve it will cause leakage and excessive calcification. An example: if you use an 8 bar pressure relief valve on a 6 bar maximum working pressure electric water heater the tank inside will build up excessive pressure (over the 6 bar maximum working pressure) leading to leakage from the tank (with a good chance of a short circuit) and excessive calcification inside the tank. So always use the right pressure relief valve.

Pressure relief valves for Lemet and Wesen electric water heaters

The pressure relief valve will kick into action releasing pressure by dripping water from that safety relief valve. For the Wesen the operating pressure is 8 bar, so if the pressure inside the tank builds up over 8 bar i twill release pressure through the pressure reliief valve. The Lemet electric water heaters have a 6 bar operating pressure, so anytime the pressure surpasses 6 bar the pressure relief valve will release the excess pressure.

Pressure reducing valve.

this is not a pressure relief valve but a valve that regulates pressure. The pressure reducing valve allows you to set the water pressure at 3 bar (the ideal water pressure) and it helps avoid water fluctuations. We recommend to always use a pressure reducing valve when you live in flat, apartment building, farm or live in an elevated area. Or if your company works from an industrial estate or old warehouse. A pressure reducing valve set at 3 bar will help avoid damage to your faucets, electric water heater, dishwasher and washing machine.

Apartment buidlng and flats

Often an apartment building or a flat will have a pump (a hydrofoor) to get the water up to the top floor. This can result in a water pressure of over 7 bar on the lower floors whilst the topfloor just has two bar water pressure. Another problem is fluctuation in water pressure when several people in your buliding use water. You can imagine that if the ground floor apartments use water at the same time there will be little water pressure on the top floor.

This can be damaging to your electric water heater and the other, before mentioned household appliances. Fluctuations will cause air bubbles to form inside the tank of the water heater eventually exposing the heating element to air causing it to overheat and short circuit.

The solution to avoid these issues is to install a pressure reducing valve. For an apartment building preferably on every floor where the water comes in. Or for a warehouse or normal house where the water mains enter your premises. A pressure reducing valve is the easy solution!

http://www.wattsindustries.com/images1/7/PDF/PRV_Applications_Guide.pdf (PAGE 8).

 

For more details regarding water pressure please consult the following links:

https://www.southernwater.co.uk/water-pressure-the-facts

http://www.ofwat.gov.uk/households/supply-and-standards/water-pressure/

 

How do I replace the thermostat?

The thermostat is really easy to replace. Here's how to do it. 

Lemet: 

  • Take the power cord from the power socket
  • GREENLINE: remove housing with signal lamp and temperature control underneath of the electric water heater and take of the temperature knob. ECOWAY: remove casing with driver
  • Gently disconnect the two white wires connected to the thermostat with a pair of fine pliers
  • Unscrew the brown wire and the blue wire (connected to the N side of the thermostat) from thermostat and unscrew the green/yellow wire from the flange
  • Take of the thermostat
  • Now install a new thermostat by pushing the thermostat into the flange. Reconnect the white wires to the thermostat. Then reconnect the brown wire and the blue wire (connected to the N side of the thermostat) to the thermostat and reconnect the green/yellow wire to the flange 
Wesen: 

  • Take the power cord from the power socket
  • Remove the small stickers covering the screws on the bottom of the water heater. 
  • Unscrew the screws and slide one of the covers away from the cold water inlet (BLUE marking) and the hot water outlet (RED marking).
  • Now do the same for the other side of the cover  
  • Gently disconnect 
How do I vent/bleed the water heater?

Switch the power off by disconnecting the power cord from the socket. Open a warm water tap. Make sure the stopcock on the mains water supply line is fully open. You can hear it fill. That noise will stop once it is completely filled. The unit is entirely filled once the water flows out in a forceful, uinterrupted jet from the opened warm water tap. Now connect the plug to the socket and switch the heater on. 

How do I empty the water heater?

Lemet:

  • Take the power cord from the power socket
  • Place a bucket underneath the cold water inlet side (BLUE marking on the water heater)
  • Close the stopcock on the mains water supply line
  • Now remove the pressure relief valve and the pipes (copper or flexible heat and pressure resistant pipes) from the water heater   
  • Put your finger on the cold water inlet side (BLUE marking) and attach a water hose to that cold water inlet side (BLUE marking) to drain off the water from the tank
  • Now disconnect the pipes (copper or flexible heat and pressure resistant pipes)  attached to the hot water outlet side (RED marking) to let air in so the tank will empty. To speed up this process you could push some air into the red side, with a bicycle pump

Wesen:

  • Take the power cord from the power socket
  • The Wesen models both have two tanks
  • Place a bucket underneath the cold water inlet side (BLUE marking)  
  • Close the stopcock on the mains water supply line
  • Now remove the pressure relief valve and the pipes (copper or flexible heat and pressure resistant pipes) from the water heater   
  • Now disconnect the pipes (copper or flexible heat and pressure resistant pipes) attached to the hot water outlet side (RED marking)
  • The cold water inlet side (BLUE marking) and the hot water outlet side (RED marking) have a nut fitted. Unscrew the nut on the BLUE marking side, put your finger on that side and connect a hose to the cold water inlet side (BLUE marking) to drain off water from the tank 
  • Now unscrew the nut fitted on the RED marking side to let air in so the tank will completely empty

Ariston:

  • All Ariston Velis water heater also have two tanks. Follow the same procedure as explained with the Wesen and you will only empty the second tank
  • To empty the first tank you must apply some air pressure,on the red side, of the water heater. You can do this by using a bicycle pump. Water will now go from the first tank to the second tank 

How do I decalcify?

The great advantage of an electric water heater is that is low maintenance. However this does NOT mean it is maintenance-free. A water heater does require maintenance from time to time.

Most manufacturers advise you to decalcify the electric water heater every 2 to 2.5 year. Whilst decalcifying you should also replace the magnesium anode and the rubber seal of the heating element. You could have this done by an installer, but you can also easily do it yourself. Below is how you can do it.

First you have to empty the water heater. Here's how to do it for each brand:


Lemet:

  • Take the power cord from the power socket
  • GREENLINE: remove housing with signal lamp and temperature control underneath of the electric water heater and take of the temperature knob. ECOWAY: remove casing with driver
  • Place a bucket underneath the cold water inlet side (BLUE marking on the water heater)
  • Close the stopcock on the mains water supply line
  • Now remove the pressure relief valve and the pipes (copper or flexible heat and pressure resistant pipes) from the water heater   
  • Put your finger on the cold water inlet side (BLUE marking) and attach a water hose to that cold water inlet side (BLUE marking) to drain off the water from the tank
  • Now disconnect the pipes (copper or flexible heat and pressure resistant pipes)  attached to the hot water outlet side (RED marking) to let air in so the tank will empty. To speed up this process you could push some air into the red side, with a bicycle pump

Wesen:

  • Take the power cord from the power socket
  • The Wesen models both have two tanks
  • Place a bucket underneath the cold water inlet side (BLUE marking)  
  • Close the stopcock on the mains water supply line
  • Now remove the pressure relief valve and the pipes (copper or flexible heat and pressure resistant pipes) from the water heater   
  • Now disconnect the pipes (copper or flexible heat and pressure resistant pipes) attached to the hot water outlet side (RED marking)
  • The cold water inlet side (BLUE marking) and the hot water outlet side (RED marking) have a nut fitted. Unscrew the nut on the BLUE marking side, put your finger on that side and connect a hose to the cold water inlet side (BLUE marking) to drain off water from the tank 
  • Now unscrew the nut fitted on the RED marking side to let air in so the tank will completely empty

Ariston:

  • All Ariston Velis water heater also have two tanks. Follow the same procedure as explained with the Wesen and you will only empty the second tank
  • To empty the first tank you must apply some air pressure,on the red side, of the water heater. You can do this by using a bicycle pump. Water will now go from the first tank to the second tank 

Once you have emptied the water heater here's how to proceed:

  1. Take the unit from the wall
  2. Remove housing: Lemet GREENLINE: remove housing with signal lamp and temperature control  underneath of the electric water heater and take of the temperature knob. ECOWAY: remove casing with driver (Part 4 on picture 2.1). WESEN: there is no need to remove anything
  3. Remove the thermostat (with the thermal cut-out) from the flange
  4. Loosen the bolts of the flange to separate the flange (with heater element and anode attached to it) from the tank
  5. Now remove the electric heater element and the anode from the flange by loosening the bolts that fix both to the flange
  6. Remove any incrustation from the electric heater element with a steel brush. You can also soak it overnight, in a bucket of kitchen grade vinegar. 
  7. Fix the cleaned heater element and the new anode with the bolts to the flange. Put the flange aside
  8. Use a water hose to rinse out any limescale from  inside the tank. Alternatively take the water heater from the wall, place the unit in the bathtub or in the shower and use the shower hose to rinse out any limescale from inside the tank 
  9. Once the tank is cleaned fix the flange with heater element and anode back on the tank. Replace the rubber between the flange and the tank. Tighten the bolts of the flange to attach the flange to the tank. 
  10. Put the thermostat onto the flange and put back the sensor(s)
  11. Close the cover and put temperature knob back onto the cover and the thermostat
  12. No hang the water heater back on the wall
  13. Reinstall the pipes to the hot water outlet side (RED marking), attach the pressure relief valve to the cold water inlet side (BLUE marking) and reinstall the pipes that connects the mains water supply line to the pressure relief valve 
  14. Fully open the stopcock on the mains water supply line to refill the tank. Meanwhile open a warm water tap. The unit is entirely filled once the water flows out from the tap in forceful, uninterrupted jet 
  15. Only then switch the power back on

How do I decalcify and replace the anode?

The great advantage of an electric water heater is that is low maintenance. However this does NOT mean it is maintenance-free. A water heater does require maintenance from time to time.

Most manufacturers advise you to decalcify the electric water heater every 2 to 2.5 year. Whilst decalcifying you should also replace the magnesium anode and the rubber seal of the heating element. You could have this done by an installer, but you can also easily do it yourself. Below is how you can do it.

First you have to empty the water heater. Here's how to do it for each brand:


Lemet:

  • Take the power cord from the power socket
  • GREENLINE: remove housing with signal lamp and temperature control underneath of the electric water heater and take of the temperature knob. ECOWAY: remove casing with driver
  • Place a bucket underneath the cold water inlet side (BLUE marking on the water heater)
  • Close the stopcock on the mains water supply line
  • Now remove the pressure relief valve and the pipes (copper or flexible heat and pressure resistant pipes) from the water heater   
  • Put your finger on the cold water inlet side (BLUE marking) and attach a water hose to that cold water inlet side (BLUE marking) to drain off the water from the tank
  • Now disconnect the pipes (copper or flexible heat and pressure resistant pipes)  attached to the hot water outlet side (RED marking) to let air in so the tank will empty. To speed up this process you could push some air into the red side, with a bicycle pump

Wesen:

  • Take the power cord from the power socket
  • The Wesen models both have two tanks
  • Place a bucket underneath the cold water inlet side (BLUE marking)  
  • Close the stopcock on the mains water supply line
  • Now remove the pressure relief valve and the pipes (copper or flexible heat and pressure resistant pipes) from the water heater   
  • Now disconnect the pipes (copper or flexible heat and pressure resistant pipes) attached to the hot water outlet side (RED marking)
  • The cold water inlet side (BLUE marking) and the hot water outlet side (RED marking) have a nut fitted. Unscrew the nut on the BLUE marking side, put your finger on that side and connect a hose to the cold water inlet side (BLUE marking) to drain off water from the tank 
  • Now unscrew the nut fitted on the RED marking side to let air in so the tank will completely empty

Ariston:

  • All Ariston Velis water heater also have two tanks. Follow the same procedure as explained with the Wesen and you will only empty the second tank
  • To empty the first tank you must apply some air pressure,on the red side, of the water heater. You can do this by using a bicycle pump. Water will now go from the first tank to the second tank 

Once you have emptied the water heater here's how to proceed:

  1. Take the unit from the wall
  2. Remove housing: Lemet GREENLINE: remove housing with signal lamp and temperature control  underneath of the electric water heater and take of the temperature knob. ECOWAY: remove casing with driver (Part 4 on picture 2.1). WESEN: there is no need to remove anything
  3. Remove the thermostat (with the thermal cut-out) from the flange
  4. Loosen the bolts of the flange to separate the flange (with heater element and anode attached to it) from the tank
  5. Now remove the electric heater element and the anode from the flange by loosening the bolts that fix both to the flange
  6. Discard the anode
  7. Remove any incrustation from the electric heater element with a steel brush. You can also soak it overnight, in a bucket of kitchen grade vinegar. 
  8. Fix the cleaned heater element and the new anode with the bolts to the flange. Put the flange aside
  9. Use a water hose to rinse out any limescale from  inside the tank. Alternatively take the water heater from the wall, place the unit in the bathtub or in the shower and use the shower hose to rinse out any limescale from inside the tank 
  10. Once the tank is cleaned fix the flange with heater element and the new anode back on the tank. Always replace the rubber between the flange and the tank. Tighten the bolts of the flange to attach the flange to the tank 
  11. Put the thermostat onto the flange and put back the sensor(s)
  12. Close the cover and put temperature knob back onto the cover and the thermostat
  13. No hang the water heater back on the wall
  14. Reinstall the pipes to the hot water outlet side (RED marking), attach the pressure relief valve to the cold water inlet side (BLUE marking) and reinstall the pipes that connects the mains water supply line to the pressure relief valve 
  15. Fully open the stopcock on the mains water supply line to refill the tank. Meanwhile open a warm water tap. The unit is entirely filled once the water flows out from the tap in forceful, uninterrupted jet 
  16. Only then switch the power back on

Here's a video on how to open the casing of an LEMET ECOWAY water heater and how to replace the heating element and anode: 

Lemet: how to replace heating element and anode


Here's a video on how to open the cover of a WESEN water heater and how to replace the heating element and anode: 

Wesen: how to replace a heating element

How do I replace the heating element and the anode?

Please consult FAQ 'How do I decalcify and replace an anode?' Or check the following video for instructions:

Wesen: how to replace a heating element

Lemet: how to replace heating element and anode

There is no water dripping from the safety relief valve. Is this correct?

Yes, this is fine. The pressure relief valve does not have to drip water, but it can drip water.


When the unit is operating the tank will heat up. This causes the water to expand inside the tank. Once the tank reaches its maximum operating pressure the pressure relief valve will kick into action and release excessive pressure by dripping (expansion) water. You therefore always need to install a discharge pipe with a tee fitting directly underneath to the pressure relief valve. This discharge pipe should face downwards and drain off any expansion drops into a drain.


Whether the valve will start dripping also depends on the set water temperature and the water pressure. Another cause that can lead to drops of water can be fluctuations in the water pressure, due to long pipelines or irregular water extraction, from the mains water supply line.


Why is my water heater making a noise?

Generally speaking a noise from the water heater is caused by calcification or a build-up of dirt on the heating element. Magnetite in the system will worsen the noise. Sand or other dirt in the water pipes can cause a noise with new water heaters. That noise can occur  immediately or after a  few weeks. Solution is to close of the water inlet near the water heater, empty the water heater and rinse the inside with a hose. Now let the water run from a tap to clean out sand from the water pipes before reconnecting the water to the water mains and opening the water inlet.


A squeaking noise signals that your safety relief valve is dirty. Cause of the dirt might stem from “dirty” water or a piece of teflon tape that has come undone. Please clean the safety relief valve first to see if this solves the problem. Always disconnect the water heater from the mains supply first and close the water inlet to the water heater before taking off the safety relief valve!


If cleaning the safety relief valve did not help please empty the water heater and rinse the tank with water. You can take the water heater down from the wall and rinse it out in the bath tub with your shower or if you can attach a garden hose on a tap near the water heater you will have to place a bucket underneath the unit before rinsing out the tank  to remove any lime and clean the heating element with a steel brush.


For more information regarding noises in boilers please check the following link:

http://www.fernox.com/problem+solving/how+to+sheets/reducing+boiler+noise

The water pressure appears to have dropped. How can this occur and what should I do?

The electric water heater never increases or decreases the water pressure from your mains water supply line. The cause can be a clogged-up pressure relief valve. You can easily remove this pressure relief valve and clean it to solve the problem. Always disconnect the water heater from the main power supply first and close the stopcock on the cold water inlet before taking off the pressure relief valve!

Please make sure you use the right pipes (copper or flexible heat an pressure resitant pipes)! If the mains water supply line has a 15mm diameter and you connect a 10mm diameter flexible water pipe to it your water pressure will also decrease.The diameter of the pipes you are going to install should always have the same diameter of the mains water supply line.

If your water pressure is still too low please check if the stopcock of the mains water supply line is fully opened. If it is not fully open you will need to do the following: open the hot water tap and fully open the stopcock of the mains water supply line so the electric water heater fills up.  At first the water will sputter out of the faucet, but eventually the water will run smoothly from the tap. That means the tank is completely filled. Now close the hot water tap and leave the stopcock fully opened.

If the stopcock of the mains water supply line is open there could be another cause for the problem. You will need to check for leakages or you might need to check with the water company, as they might have a pressure problem. If it is none of the above please consult an installer to fix the problem.  

Why is the water heater malfunctioning?

Several causes can lead to the water heater to malfunction. The most common malfunction is the thermal fuse that switched off the water heater. This can occur if the tank was not sufficiently filled with water when the power was switched on. First open a warm water tap and fill the water heater with water. Once a forceful jet of water flows from the tap reset the thermal fuse by pushing the reset button. The reset button can be found where the anode is attached to the power cord. Please note, that the location of the button can vary per electric water heater. The picture below is of a 30 to 100 litre Lemet electric water heater, but gives a good indication of where the button is found. Please be cautious with electricity!  

Why does the water, in the electric water heater, cool down so quickly?

You might have chosen an electric water heater with insufficient capacity. For example, you have a 5 litre electric water heater and you use it to produce hot water for your kitchen tap, but you are a family of 3. The first person will have sufficient hot water, but the second and third person will not have sufficient hot water to wash their hands, simply because of the limited capacity of the electric water heater. If you have a 5 litre water heater bear in mindthat  it will only supply you with 5 litres of hot water, which is half a bucket of water. Once the 5 litres has been used the electric heater will need to refill and reheat the water. TIP: When purchasing a water heater be sure to check if the capacity will suit your needs.

A rain shower, for example, will use twice as much water, than a regular shower head. Please bare this in mind, when selecting an electric water heater.

Another reason for the water not to be hot enough: It could be that the set temperature is too low. If you have set your temperature at 60°C (140 °F) you will never have optimum efficiency. For example, if you shower at 45°C (113°F) then you will need lots of hot water and little cold water. The best solution, to this problem, is to set the temperature higher. This way you require less hot water from your heater and the hot water, in the tank, will last longer.

Other causes can be that there is air in the pipes of the electric water heater. This can be solved by venting the system (please consult the manual for a step by step explanation).

Another cause could be that your heater has insufficient heating power, because you use a timer. Solution: set your timer earlier to allow sufficient time, for the electric water heater, to heat up the water inside the tank.  

Why is the water not heating up?

Please check if the power is switched on and if you have the water heater on the highest setting (for a Wesen heater the ideal setting is 65 degrees). Also check if there is no air in the water heater and if necessary bleed the air from the heater.


How do you bleed air?

Open the hot water tap above your sink and make sure the stopcock of the mains water supply line is fully opened so cold water, entering the tank of the water heater, runs freely. Close the hot water faucet once the water flows out in a forceful jet.


With a digital water heater you can sometimes solve the problem by temporarily switching the power off, then turning the power back on again. In doing so you reset the water heater. In most cases this will resolve the problem. However, if the water still does not heat up please take the following steps:


Analogue water heaters:

  • Set the water heater to the highest setting and check if the light switches on. For a Wesen do not set the temperature higher than 65 degrees.

  • Please check if the knob of the thermostat is firmly fitted onto the heating element. Remove the front cover to check if this is indeed the case. Turn the knob of the thermostat to the highest setting, and check if it is heating.

  • Gauge if there is voltage present when the water heater is heating and if the light switches on. If there is voltage present, but the water is not heating it could mean a faulty heating element. You will need to replace the heating element. Another possible cause, for the water not heating up, could be a faulty thermostat. If that is the case please replace the thermostat.


Digital display water heaters:

  • Set the water heater to the highest setting and check if the light switches on.

  • Gauge if there is voltage present when the water heater is heating, and if the light switches on. If there is voltage present, but the water is not heating up that can be due to a faulty heating element. You will need to replace the heating element. Another possible cause, for the water not heating up, is a faulty thermostat. If that is the case please replace the thermostat. The digital display could also need replacing.

Lemet Ecoway: Does my water heater remember the set temperature if the power is cut?

The Lemet Ecoway remembers the last set temperature before the power was cut off. It will reset to that temperature once the power is switched back on again.


If you used the ECO setting before the power was switched off the water heater will reset to ECO mode, this can take up to 2 or 3 weeks. ECO mode is a self-learning program that looks at when you use water and how much water you use and then programs itself accordingly. In the mean time you will of course have hot water on demand.

Instant water heater: Why is the water not hot enough?

There could be a number of causes:

  1. The water pressure is too high. Most probably there is nothing wrong with your instant water heater. Your water will most likely be hot enough if you do not fully open the cold-water inlet.

  2. The instant water heater has a thermal fuse that could have blown. This fuse can be found near the connection to the power cable. In the middle of the circuit board you can reset the instant water heater by pressing the grey button of the thermal fuse. 99% of the times your problem will be resolved by resetting the fuse. After resetting the fuse, slightly open the faucet till the red light comes on, now wait for 20 seconds. The water will now heat up.

http://www.elektrischeboiler.eu/image/data/Wijas-reset.jpg

Instant water heater: the water in the electric water heater cools down too quickly. Why?
The cause of this can be that the water pressure is too high. The instant water heater is most probably working just fine. Your water will most likely be hot enough if you do not open the water supply tap fully. 
 
The instant water heater has a thermal fuse too. This fuse can be found at the connection to the power cable. In the middle of the circuitboard you can reset the instant water heater by pressing the grey button. 99 out of a 100 times your problem will be solved. After resetting turn the tap slightly open till the red light comes on, now wait for 20 seconds. The water will now heat up.
 
My electric water heater is not working. What should I do?
There can be a number of reasons for your electric water heater not to function properly.
 
Most frequent occurring error is that the thermal fuse switches off. That will shut the electric water heater down. This can happen, for instance, when you switch on an electric water heater that doesn’t hold enough water. 
 
Fortunately, this malfunction is easily fixed by pressing the reset button. This small white button can found on the thermostat. Below is a picture of a 30 to 100 liter Lemet electric water heater, so you know where to find the button. Please note, that the location of the button can vary per electric water heater. Please be cautious with electricity!


Ariston Velis: How do I diagnose the problem and reset my heater?

If there is a malfunction in the Ariston Velis controller alle leds will light up simultaneously.


Diagnose function: Press and hold the on/off button (A) for 5 seconds. The leds will light up simultaneously showing there is a malfunction. Once you have checked what the malfunction is please press and hold the on/off button for 25 seconds to return to the normal mode.

Understanding the malfunctions within the diagnose function:

  • LED ref 1 - Internal error (controller/circuit board)

  • LED ref 3 - Defective temperature sensor

  • LED ref 5 - Water temperature too high (gauged with a separate sensor)

  • LED ref 4 and 5 - General temperature too high (gauged by controller)

  • LED ref 3 and 5 - Sensor error

  • LED ref 3 and 4 - No hot water with the heating element on

  • LED ref 3,4 and 5 - Not enough water in the tank

  • LED ref 2 and 3 - Defective temperature sensor

  • LED ref 2 and 5 - Water temperature too high (gauged with a separate sensor)

  • LED ref 2,4 and 5 - General temperature too high (gauged by controller)

  • LED ref 2,3 and 5 - Sensor error

  • LED ref 2,3 and 4 -  No hot water with the heating element on

  • LED ref 2,3,4 and 5 - Not enough water in the tank


Reset: Switch off the machine by pressing the on/off button (A). Ideally you should do this only once you have run a diagnosis and the leds have just turned off.

Lemet Ecoway: Error message ER02 with Ecoway electric water heater

This error code could indicate that there has been fluctuations in the water temperature. This error is easily solved by changing parameter F4 01 to F4 00. To do so, go to the service menu (for a step-by-step explanation please consult the manual). You can download the manual by using the following link.

To reset Er02 – please press the "OK" button

Step-by-step guide:
1. Turn off the controller with the "on/off" button

2. Press and hold the “on/off” button until the display shows F1 - 01  
3. Press the "OK" button a number of times until the display shows F4-01
4. Select F4-00 by using the “up/down” button
5. Press the "OK" button a number of times until the display switches off
6.
Switch on the controller with the "on/off" button

  

STEP 2  (If step 1 fails)


1. Switch off controller by turn on/off button (first one from left) - the display should be black, just LED power should be light (sometimes also Heater LED could be lit).

 

2. Then press and keep PROG Button untill on display will be show f1-01 - the rest you know. (Continue with the other steps)

  

P.S. If on display it is ER-02 before point 1 press OK button.

 

Wesen: What are the error codes of my Wesen water heater?

The display can show the following error codes:


E1: Boil-dry protection: This error code is displayed when the heating element becomes too hot and the thermal fuse has short circuited. This usually happens when the tank, in the water heater, is empty or has an insufficient water level. An air pocket inside the tank or insufficient water supply may cause this problem. Check if the cold-water inlet is fully opened.  If this is not the cause of the problem disconnect the water heater from the main power supply and check the safety relief valve for dirt (do not forget to close the cold-water inlet first!). Once you have checked all probable causes wait 2 hours to let the unit cool off before reconnecting the water heater to the main power supply and switching it back on again.


First check if the water-inlet is fully opened. If this is not the cause of the problem disconnect the water heater from the main power supply and check the safety relief valve for dirt (do not forget to close the cold-water inlet first!). Clean the safety relief valve by blowing dirt from the valve, check for teflon tape on the iinside of the valve and rinse the valve under a tap to remove any remaining dirt.  


Then also check if there is no air bubble inside the tank by bleeding air from the water heater.


How do I bleed air?

Open the hot water tap above your sink and make sure the stopcock of the mains water supply line is fully opened so cold water, entering the tank of the water heater, runs freely. Close the hot water faucet once the water flows out in a forceful jet.Wait 2 hours to let the unit cool off  before reconnecting to the power supply and switching the water heater back on again.Problem should be solved. If not please contact us.


E2: This error code is displayed when the temperature sensors do not gauge the temperature properly.  Disconnect the water heater from the main power supply by pulling the power cord from the power socket and open the front cover, of the water heater, at the bottom. Now check if the white wire is connected to every single heating element and check if these wires are properly connected to the plugs on the display. You hear click when connecting the white wires. Problem should be solved. If not please contact us.


E4: Overheating protection. This error code is displayed when there is a chance of the water heater overheating. This could be caused by an air-pocket that is trapped within the tank or due to an insufficient water supply (faulty safety relief valve or the water-inlet that is closed or only half opened).This usually only happens when the water heater is started up for the first time. Always make sure you have topped up the water heater sufficiently before connecting the water heater to the main power supply.


First check if that the water-inlet is fully opened. If this is not the cause of the problem disconnect the water heater from the main power supply and check the safety relief valve for dirt (do not forget to close the cold-water inlet first!). Now disconnect the water heater from the main power supply and check the safety relief valve for dirt (do not forget to close the cold-water inlet first!). Clean the safety relief valve by blowing dirt from the valve, check for teflon tape on the iinside of the valve and rinse the valve under a tap to remove any remaining dirt.  


Then also check if there is no air bubble inside the tank by bleeding air from the water heater. See above how to bleed the unit. Once you have bled the unit please wait for 2 hours to let the unit cool off before reconnecting to the power supply and switching the water heater back on again.



Wesen: How do I change the controller of my Wesen Flat water heater?

To change the controller of the Wesen Flat electric water heater please consult the following video: 

Change my controller of my Wesen water heater

Wesen: How do I change the display and sensor of my Wesen water heater?

To change the display and sensor of the Wesen Flat electric water heater please consult the following video: 

Replace display and sensor of my Wesen water heater

Wesen: How can I remove the cover of my Wesen Flat water heater?

To remove the cover of the Wesen Flat electric water heater please consult the following video: 

remove cover from my Wesen water heater

Wesen: How do I change the heating element of my Wesen Flat water heater?

To change the heating element of the Wesen Flat electric water heater please consult the following video: 

Change heating element of my Wesen water heater

How do I minimize limescale build-up in the tank?

By connecting the anti-limescale magnet to the water pipes on the blue side the positively charged calcium particles in the water are charged negatively for 70 hours so the particles will not stick together causing calcification of the anode and heating element. Using a anti-limescale magnet will increase the lifespan of your water heater.


You can order the anti-limescale magnet when you look in the accessories and spare parts section:
http://waterheaterstore.co.uk/spare-parts


Or you can order it as an option when ordering a water heater on our website


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