Powder solenoid I hav e an AEG Favorit 50700 sensorlogic dishwasher. As soon as I switch on, before even selecting a programme, the solenoid to operate the powder dispenser door operates, then stays activated until I remove power. I've taken the door liner off and the PCB looks OK - but I guess whatever powers up this solenoid has gone short circuit. Any idea what it might be or might look like?
Dishwashers - AEG - 24 in. Favorit 50730W Free-standing Dishwasher
Answers & Comments
The no-brainer answer is to replace the controller board. But I just saw the price on line was 248GBP ($350) which is not going to be worthwhile. I just had the same problem with the same model dishwasher. When I checked my circuit board under a microscope, I saw cracking and discoloration on what appears to be a ceramic capacitor. It looks like this capacitor is for snubbing the transient across the triac used to control the soap dispenser solenoid. I do not know what value this capacitor has, but I am about to replace it with a 47nF, 630V ceramic capacitor in a 1206 package. That costs $0.59 from digi-key (part number 445-8794-1-ND) I am sure that Colin999 has trashed his dishwasher by now since he posted his question over 4 years ago. I will post an update with the results when I get the part installed.
It seems that I guessed correctly. The dishwasher is now fully operational. What most people are forced to do in situations like mine and that of Colin99 is to buy a new controller which costs nearly as much as a new dishwasher. In fact all that was needed was a $0.59 capacitor. Well not quite. My 30 years of experience in electronics allowed me to find the fault and guess the capacitance of the failed part. Better would be if all manufacturers provided full schematic diagrams. Then anyone with some basic tools could replace the broken part
Probably the main module ie the pcb you were looking at