Bosch table top dishwasher, not heating in wash, dries ok.

[kirkyboy]

Hi,

First time in this forum as I can fix most faults myself. However I now need some advice on a Bosch SKT5102GB table top dishwasher.
The water does not heat during the wash cycles however towards the end of the final rinse and during drying it does heat up so clearly the heating element is not at fault.
My thoughts are maybe the programmer which is not setting the correct temperature or the temperature sensor but I’m not sure how it functions at the end of rinse and for drying, does it just switch heater on permanantly?
Any suggestions much appreciated.
kirkyboy

[Martin]

Re: Bosch table top dishwasher, not heating in wash, dries o

That doesn’t make sense in all honesty. It completes and washes OK means it works OK. So how do you know it does’nt heat during the wash cycle? Is it taking any longer to complete the cycle?

[kirkyboy]

Re: Bosch table top dishwasher, not heating in wash, dries o

I didn’t say that it washes OK though it does complete cycle amd I think in the correct time.
I suspected there might be something wrong when it didn’t feel at all warm on the outside during the wash but did when drying and inside was hot.
I stopped the cycle at several points during wash and at no time was the water hot except right at end of final rinse.
Put a temperature temp sensor on inside connected to digital thermometer outside and kept checking during a wash. This confirmed that it does not heat in wash cycle.

kirkyboy

[Martin]

Re: Bosch table top dishwasher, not heating in wash, dries o

Then it must be a fault with the control unit I would think. Most odd fault and not one I have encountered until now. 🙁

[kirkyboy]

Re: Bosch table top dishwasher, not heating in wash, dries o

Thanks for that. I did wonder about the temp sensor which I’m assuming is a NTC thermistor. I thought maybe it’s not reading temperature correctly so not heating up during wash, but don’t know how the heat function for drying is controlled, if at all. Does it simply switch on heaters just before the end of final rinse and during drying with no temperature control so heaters on all the time?

Managed to find where the sensor is located and removed it. Reads open circuit at ambient temperature and then shows resistance when it gets hot but didn’t test this at set temperatures so can’t be sure if readings would be correct. Does seem to indicate though that it may be functioning ok.

That leads me to think the control unit is faulty as you suggested but does seem very unusual. If that is the case I guess it’s not going to be worth repairing.

kirkyboy

[Martin]

Re: Bosch table top dishwasher, not heating in wash, dries o

The NTC readings are in K/ohms so it sounds like you didn’t set your multimeter on the correct scale. 😉

NTC’s on these are very reliable. I will stick with my first hunch for now. 😀

[Author]

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