Bosch SGS59A12GB/17 d/w

[Penguin45]

Horrible sludging problems, giving the 1 minute fault. Thoroughly cleaned out (subject of illustrated article to follow 😀 ) – still getting 1 minute fault. Machine does heat and will complete the cycle with extended wash times.

So…….. turbidity sensor – can’t get any reading though it at all with test meter – this can’t be right? Have ordered one just in case. Or possible module fault? Seems unlikely with it actually doing the programme, albeit slowly.

Any advice gratefully received.

Thanks,
Chris.

[gegsy]

Re: Bosch SGS59A12GB/17 d/w

Hi Chris
The voltage from the “receiver” photo diode will be quite small. It is quite possible that the meter may “pull” the voltage down due to its own circuitry 😕
You should however on a diode setting of your meter (analogue meter better) be able to get a resistence reading one way on each of them as they are both diodes in theory (Photo and LED).

Most probable causees of the slow cycle is
1/ Crud attached to face of heater where sensors actually “look” at each other 😉
2/ Crud restricting breather at the top of heat exchanger
3/ Restriction in water metering unit and/or transfer tube causing poor flow through of water from matrix
4/ Module lost the plot

Worst one I had was a customer who was a mobile donut bloke, just dumping the mix tubs in the dishwasher. It set like concrete 😯 and conpletely wrecked the machine. 👿

HTH

Greg

[Author]

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