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Hotpoint WML730 pump / PCB problem


Gary Sher

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Hi I was hoping for some guidance on sorting out my hotpoint WML730 washing machine.

 The pump had started leaking on this to the point that we only realised when it packed up. Pump was replaced with a new one but it didn't work. Testing the pump in isolation showed it was working fine when 240v was applied to it.

I put a meter across the wiring from the PCB to the pump and this showed that only a voltage of around 130-135v was coming to the pump. 

Checking the PCB circuit board showed that one of the transistors in it had "blown up" - it is the one marked as Q011 on the board and marked as Z0107NA. The contents of the rest of the PCB looks intact. No dry joints, bulging capacitors etc.. 

The burned out transistor has been replaced but it has not solved the problem. The output to the pump is still around 135v. 

Any help would be greatly appreciated in pinpointing where the problem might be. 

Many thanks

Gary

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