[janfi123]

Hi again,
Sorry for the delay, doing any experiments during the week is tricky.

I tried two cycles after the “vacuuming” the pump bay and both times it didn’t heat the first time (for washing) but it did heat fine for drying.

However, I have a new piece of information – I am quite sure that it is not due to the relays but the logic (sensor?) instead. This is what I tried now.

There are two relays for the heater, one switches Live, the other Neutral. The relays are switched on by up to 12V DC (that’s what was written on them) so I soldered cables to the switching coil of the relays and measured voltage while the dishwasher was running. If there was voltage but the power monitor didn’t show load, it would be clearly the relay fault, i.e., the logic wants to switch the heater on but one of the relays fails so there is no power on the heater so no load.

What happened instead is that shortly after the tablet dropped, both relays switched for a very short moment, perhaps 2 seconds. I could see the voltage on both of them and also the power monitor showed for a moment 2.5kW consumption. But after the second or two, the voltage on the relays dropped and the heater disconnected. I would say that such a case must be due to some faulty reading which triggers the logic to disconnect.

I will check again te bay with the mirror but I don’t think I will see much.

There are altogether 3 sets of cables to the heat pump – for the heater, for the motor and 3 thin ones, presumably for temperature measurement? Would you know what measurement should I get on those?

If you have any further ideas, please let me know.
Jan

[janfi123]

Thanks a lot, Kaibart and Dave.

I checked the filter but it wasn’t too bad, I noticed that the optical sensor in the filter bay was covered in junk so I cleaned that as well. I also looked at the PCB & relays but they all didn’t have any visible signs of issues. During the run the first water heating was fine but it didn’t work for drying and got E04 error at the very end.

What would you recommend next? Exchange the relays? Is there any sensor which would stop the water heating and I could measure?
Thanks again,
Jan

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