Junkers WRDP 11-2 B23 Operation Error & Self-Activation: EA Error, Display Lights, & Heating

Hello.
I have had it for over 3 years Junkers WRDP 11 - 2 B23 with display.
Junkers generally works without problem, ignites quickly and heats the water.

The problem arises, however, when you do not want to use the junker.

Namely, usually after a fairly long time from turning off the water and the junker goes out, after about 2-3 hours, there is a problem that when the water is not turned on, the junkers seem to turn on by itself - first you hear some kind of knocking or slight crackling, then a gentle squeak, the display turns on in turn - the temperature rises - from 20 to 40 degrees, then the red light under the display lights up, the EA error appears on it and everything turns off and goes away - the EA error remains. I note that it happens completely arbitrarily, without turning on the water.

If after that, for example, I turn on the tap normally - the junkers lights up normally and quickly and heats the water.

Thus, the junkers fulfill their task all the time, because it works and heats the water, but its kind of turning on and tapping is annoying - which usually happens late in the evening or at night.

Does anyone have any advice on what it can be and tips on how to remedy it. I have read many similar topics and the junker's manual before, however I have not found a similar problem and its solution.

Thanks for all helpful advice and time.

One minute of searching on the net and in the manual there is a mention of an EA error.

Quote:

Problem:
Sparks are generated but the main burner does not ignite, the appliance is blocked.

Cause:
No signal from ionization electrode (digital display shows EA)

Check:
- gas supply.
- ignition (ionization electrode and solenoid valve) *

You already have a starting point.
It would be appropriate to look in the manual to see if the heater can automatically start any operating mode.
Unless the cause of these strange noises and behaviors is a malfunctioning solenoid valve, which, for example, has a tendency to let gas through, and as a result, the burner turns on automatically.
In general, everything indicates that the problem is on the side of the gas circuit, so better call the service and do not try to figure it out yourself.
Alternatively, you can try to do something with the ionization electrode yourself, it may be a matter of e.g. cleaning.
Colleague @ serwisszulborski.pl seems to be a professional Junkers specialist, so maybe he will write something more, because I'm just an amateur drawing conclusions based on your description of the fault and information from the installation and operation manual of this heater and my private experience.

Hello.
Thanks for showing interest.
I checked what the EA error means, but how does it relate to my fault - because it does not arise when I try to turn it on by myself, and the spark also does not arise automatically - there is only a knock, some squeak, an increase in temperature on the display and that's it.
I would like to avoid calling a service technician, because it is known after the warranty, but if necessary it is difficult.
Thank you once again.

The error may not be related to your fault directly, but it indicates what elements may be responsible for it, so as I wrote, you already have a starting point.

If the temperature rises, there must be a fire on the burner, otherwise the temperature increases.
But you say there's no spark, that's where the fire comes from. Unless the electronics are stupid.
Assuming that there was a spark, a faulty ionization electrode may result in turning off the burner, e.g. cleaning this electrode helps me.
Only where does the burner start automatically, if the heater is not used.
As for me, it is impossible without the service. Let it be reliable, because some service technicians replace parts at random, as if they cannot give an accurate diagnosis and do not know the devices they service.

The defect is also not evident, because as you describe it is not continuous but it appears sporadically at night, but maybe for a real professional it will be sufficiently meaningful.

First, try to talk to the service by phone and what he will tell you about it. Sometimes it is possible to sense how kumaty and trustworthy someone is.

You probably live in a block of flats / tenement house?

It seems to me that the temperature rises only on the display - but there is no water, no gas, no flame - so probably something with electronics.

Added after 2 [minutes]:

Yes, a 10-story block, I am on the 3rd floor.

You will need to do a little test: when not using the Junker, close the cold water supply to the above-mentioned. devices.
Are there hours in which this phenomenon increases?
There are no leaks from the junkers?

Usually in the evening and at night - but on the other hand, during the day we are not at home, so I do not know, and immediately after returning from work it is loud and I may not hear it, and when it is already dark and the children are asleep, it is quiet and then you can hear all the sounds from the bathroom :)

There are no leaks.

Test - turn off the cold water tap on the turned off device and then what to do?

Falkirk2011 wrote:

Test - turn off the cold water tap on the turned off device and then what to do?

Observe whether the junkers will try to start automatically.
You are probably dealing with high pressure drops in the block as well as subsequent water hammer.
If the symptoms disappear after closing the valve, what I wrote above will be confirmed. But I am not 100% sure.

Ok, thank you, I'll take the test tonight.

Magister_123 wrote:

You will need to do a little test: when not using the Junker, close the cold water supply to the above-mentioned. devices.

It was enough to write directly that you suspect problems with the water pressure and temporary pressure drops may cause backflow of tap water, which the heater reads as starting the flow by turning on the tap.
It is also possible, but in practice I have never experienced such a symptom personally, neither at home nor with friends. I think someone on the electrode once gave a video of how the water meter retracts slightly.

OK, you guys already got along in the meantime ;)

If the suggestion @ Magister_123 confirmed, you will have to install a pressure reducer that will protect your home installation against pressure surges that can be harmful to devices. If you do not have a place, it is worth adding a mesh filter at the entrance to the apartment to filter small rubbish that can flow with water.
I do not know if the pressure reducer also acts as a check valve, but if not, it is worth adding one during modernization so that the water always flows only in one direction, which will protect you against unwanted water backflow.

Hello, I'm reviving the topic a bit because I have the same problem. The stove starts to crackle as if it wanted to turn on after some time, the coil starts dispensing gas and at that time the display starts to show a quite high temperature, about 60 degrees, and after a while the EA error appears. The junker service was at my place but he said everything was fine, even though I showed recordings, photos, etc. I was unlucky because everything was fine when he visited, as it happens several times a day. I replaced the electrode and nothing helped. Any ideas?

There may be two reasons:
-damaged electronics
- the microswitch located under the junction box is damaged or needs to be adjusted. White housing with two black wires.

Hi. In my boiler (Junkers WRD9-4KB HYDRO 4200), even though I don't turn the water off, the flame icon lights up once in a while even though there is no fire on the burner, even the display doesn't activate, only the flame icon and for it to disappear all you have to do is fire up the boiler for a while and then turn it off, but after a while the icon activates again

Replace the batteries.

This symbol indicates that the cooker is operating, not that the battery is discharged.