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Miele G5985 dishwasher F78 error


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My Miele G5985 is throwing F78 (circulation pump) shortly after start. It may run a minute or so. But then I get the error .

I exhanged the circulation pump for a used one. Same error. 
I exchanged the electronics for a used one. Same error. 

I am thinking that the used parts (or least one of them) has the same issue as the ones I removed from the DW. 

I have measured the voltage level to the pump, measured at the electronics. I see from the service manual that one pin should be 15v, but I measured 13v. Not sure if this is the issue?

Can someone please send me the diagram? (I have the service manual ). Any advice is much appreciated. 

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