Siemens washer dryer iq300 – not drying.

[asdrewq]

Hi All,

I have an issue with my Siemens washer dryer – on the dry cycle it is not heating the air up at all.

It’s this model. If you click across on the pictures you will find the dryer section:
https://www.siemens-home.bsh-group.com/uk/supportdetail/product/WD14H320GB/02#/Tabs=section-spareparts/Togglebox=tb0522/

I thought it would be that the thermal cutouts had tripped but this model doesn’t have re settable ones like i’ve read some do – you can only test them by pulling on the central pin to see if they break continuity. There are 3 thermal cutouts – 2 on top & 1 on the front section (as seen in the parts diagram page 04/06 – 0522 & 0527) – all tested ok – continuity fine when resting.

The heater element itself tests at 35.6ohms – again I think that’s ok?

That’s the limit of my knowledge – anyone have any ideas?
Is there any test procedure/error codes readout I can do on this machine?

Cheers,

[electrofix]

there are 2 ntc’s controlling the temp items 0508

Dave

[asdrewq]

electrofix wrote:there are 2 ntc’s controlling the temp items 0508

Dave

Hi, do you know how I go about testing those? As they are before the fan & down in the condenser bit .i.e. not where it gets hottest on top, I thought it wouldn’t be them. shouldn’t they throw an error code?

[electrofix]

will only throw an error code if they are beyond whats expected. If they convince the machine that its already hot then it wont heat or it wont heat much

one is sensing the air temp going into the drum
the other is sensing the return air temp
both have the ability to turn off the heater if temp rises too high

Dave

[asdrewq]

I bought a new NTC sensor just in case & tested them today – both those in the machine checked out ok – read roughly the same at room temp as the new one (~60kohm) & decrease in resistance when held in palm of hand.
I think it must be the control board at fault, perhaps the relay? I looked at the board today & it looks like the dryer operation is controlled by a smaller daughter board mounted on the bigger one & it only has a single relay that looks to be in line with the heating element. Nothing obviously wrong with it – no corrosion etc.

Has anyone heard of that ever being at fault?

[electrofix]

did you check the wiring harness from the heater back to the board including the overheat stats ?

Dave

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