Bosch Dish Washer SMS53A02GB/01Heat Pump

[Landy813]

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Hello all,

I am trying to find out if my PCB is bust, as the machine just runs as normal without getting hot with no error codes. I am only getting 100 v to the Heat pump I have written the resistances i get across the element and what i think is the NTC sensor on the photo and they seem ok, i think?

Should I be getting 230v at the heat pump or should i be looking else where for the fault?

Any help much appreciated.

Landy

[electrofix]

Re: Bosch Dish Washer SMS53A02GB/01Heat Pump

dont know the whole story with these but
the heater will be the 2 red wires. bit worried about your resistance reading as with 18 ohms and a 230v supply give you a current of 12.7 amps which is too high. the other wires should feed the motor which is a 3 phase unit and may well work on 100 volts i dont know
double check the heater continuity if ok its something else

Dave

[Landy813]

Re: Bosch Dish Washer SMS53A02GB/01Heat Pump

Just re-check it with a calibrated Fluke from work and it is defo 18.5 ohms.

Landy

[Landy813]

Re: Bosch Dish Washer SMS53A02GB/01Heat Pump

Just done some more checks, the voltage at the heat pump when connected is only 24v but when disconnected the voltage rises to 120v. So it could be a short across the element as both cables read 24v when connected to the pump.

But surely the feed to the heater must be 230v?

Landy

[Landy813]

Re: Bosch Dish Washer SMS53A02GB/01Heat Pump

Well not to sure what i have done but it is now working again. I stripped the bottom and then stripped down the heat pump checked the control module for any obvious signs of damage then put it all back together. Then de-greased the condensation/fill assembly thing on the left hand side.

Lets hope it keeps going!!!

Landy

[Author]

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