Smeg DWI612C fault – not PCB

[side-track]

I have a fault similar to those reported before – dishwasher behaves normally (including soap dispenser opening) until the end of the wash cycle, but then rather than draining, I get two beeps and a drain pump pulse, which keeps repeating every few seconds. No fault code is displayed.

The suppressor seems ok – no sign of any damage.
The soap dispenser solenoid seems ok – operates as it should and no visible signs of corrosion, or deterioration.

I thought that must mean a logic problem and therefore a pcb fault. I have a neighbour with the same machine so I swapped pcbs : mine works fine in his machine and I get the same fault in my machine with his pcb. So the fault can’t be there.

Any suggestions of where to go from here?

[johnsdad]

Re: Smeg DWI612C fault – not PCB

check appliance for low insulation resistance

[side-track]

Re: Smeg DWI612C fault – not PCB

Thanks. Can you advise how to do that?

A point that may or may not be relevant. When disconnecting the pcb, the rcd at the consumer unit tripped, which I thought was strange, considering the machine was switched off at the plug socket. It tripped again when I reconnected the pcb – again the socket switch was off.

[johnsdad]

Re: Smeg DWI612C fault – not PCB

with a 500v insulation tester.
P.S. always UNPLUG when checking, never trust both poles will switch off on a socket

[side-track]

Re: Smeg DWI612C fault – not PCB

I think I can get hold of one of these. If the insulation resistance is low, what then? Is the machine scrap? Or is there a way of identifying where the insulation is defective?

[Penguin45]

Re: Smeg DWI612C fault – not PCB

No, it’s a process of elimination to identify which exact component is failing. You’ve obviously read the “5 LED” article, so mains suppressor, dispenser solenoid, motor capacitor and additionally heater are all possible suspects. If they all check out with damn near infinite earth readings, the pcb is the only component left – they do fail.

Penguin45.

[side-track]

Re: Smeg DWI612C fault – not PCB

Update :-

Further substitution with parts from my neighbour’s machine showed it was the soap dispenser solenoid. A new soap dispenser solved the problem.

There were no signs of failure on the solenoid and it still operated as it should. I can only assume from prevoius posts that it was just starting to break down internally and thereby affecting the logic of the pcb.

Thanks for the help.

[Author]

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