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Re: Bosch Dishwasher Soap Dispenser Fault
I got the replacement triac and carefully unsoldered the failed one (using low melt solder) then soldered the replacement and refitted the module. Waited while the wash was progressing and at 75 mins indicated on a normal wash cycle the wax motor activated the dispenser arm. Success! Very happy to have it all working as advertised and only for a couple of quid not the £100 to replace the whole module. :tup:
Re: Bosch Dishwasher Soap Dispenser Fault
If anybody else suffers this problem and it turns out to be the control module then I have uploaded a photo of the failure mode of the triac in question. As Martin posted in his reply, it was quite obvious which triac had failed as it had indeed blown the top off! See photo with failed TRIAC circled. If you zoom in you can just see the crater in the triac (quality not great but you get the idea of component location and failure)
The triac is an SMD triac part number Z0109MN (=Z9M) and can be bought for pence from many electronics suppliers. I will have a go at fixing the board over this weekend and report back on the success or otherwise.
Re: Bosch Dishwasher Soap Dispenser Fault
Martin,
You’re correct, I havent yet had the control board out to check, that is my next job for this weekend! As you say the damage may be obvious when I do get it out. Do you know if the triacs are the ones that have a D cross section (like a transistor) when viewed from above or if they are ones that can be mounted to a heat sink (with a metal tab attached). Thanks for your reply
