Hi,
thanks for all thread visitors. I suspect my dishwasher has become a victim for undervoltage. Right after fixing the fault, previously totally functional machine now indicates an error (about assumed overflowing which doesn't exist) so I suspect some component(s) on its control pcb didn't like the undervoltage and now takes a normal sensor value as a faulty one. Which components on the pcb would be the first ones worth checking?

 

Usually, Electronic-Components on a Circuit-Board will not be damaged by "Low-Voltage".

Motors are the item that is normally damaged by over-heating, caused by Low-Voltage.

Transformers may also be over-heated for the same reason.

Electronics can be damaged by "Voltage-Spikes"
if adequate protection is not designed into the Circuit.

It sounds like You are guessing.

The first thing to test is the Over-fill Safety-Switch/Sensor.

Without a proper Electrical-Schematic, You will be very limited as to what You can test.
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A "reset" may be needed because sometimes fault condition signals are latched.

 

You're right, I'm just quessing. But on the following time line
"ok">>>A>>>B>>>"not ok" , where
A: electric fault was detected in the house (one phase missing due to defective main switch )
B: the fault was fixed,
between A and B I once switched the dishwasher on to see if it got power (which it seemed to do as indicated by leds). I didn't use the machine, just switched it off again. However, the machine was connected on the missing phase and only got some (low voltage) power due to "phase leakage" generated by heating elements in the boiler - obviously that was enought to light the leds. The "low voltage" situation could also be seen in some lamps on the same phase, they were much dimmer than normal.

That's why it seems reasonable to suspect an electronics fault instead of mechanical one.

 

Did you check the sensor?

 

The "reset"function that I suggested previously is not often included in the consumer instructions, but in the service literature hidden within the dishwasher control panel assembly. At least that is where I found mine. An alternative could be to switch off the power source completely the dishwasher for a longer time period, maybe an hour, and then switch it back on and try it.
It may also possibly be that there actually is a low voltage condition at the dish washer appliance.

 

I found a reset function by holding the program selector button down a few seconds, but that only seems to clear the failure status indicators.
Next start caused the same failure. I have also tried unplugging the machine for a longer period.

 

It may be that there actually IS a low voltage condition at the dishwasher power connection. Or perhaps in the circuit breaker panel. The fact that some portion of the original problem was repaired does not mean that all of the damage is repaired.
I once had to replace a double circuit breaker for a clothes dryer, after changing the outlet, because one side of the breaker would open under load while the other side did not open. So she had replaced the dryer because the breaker had failed. Uncommon failures do happen and they are seldom suspected. I do not recall the brand of the panel but some brands are not nearly so good as other brands..