Siemens IQ300 Washer/Dryer Not Drying – NTC Cut-Out (Resetting Starts Drying Again)

[joakes]

Hi all – thank you very much for all the great information.

I have been wrestling with this IQ300 Washer/Dryer for years. I replaced both NTCs (resettable one next to the heating unit and the one just by the air duct) with no improvement. It basically runs OK for about an hour and then trips the resettable cut-out and continues to blow cold air. Rather surprising that there is no sensor for this and basically a 2 hour cycle runs with mostly cold air.

Are there any other elements that may be causing this? Are there only two NTCs? Or is there an exhaust one too? Thank you very much for all the help in advance.

[electrofix]

would need full Enr no to look up parts

most of these faults are down to blocked ducts with lint causing slow air flow

Dave

[joakes]

Thank you very much, Dave! It is WK14D320GB. Already cleaned both the heating duct (the metal one blowing air into the drum) and the condenser duct (underneath the fan). Heating duct was nice and clean. Condenser duct had some build up but nothing crazy. Cleaned the fan blades too but again nothing to affect the air flow.  I checked the resistance changing with NTCs with a multimeter. Just learnt that there may be a service mode with these to actually see the reading the PCB is getting so will check that next time.

[electrofix]

no cant see a second ntc on the return. was wondering if they get information from the wash NTC. Are wash temperatures about right ?

Dave

[joakes]

Interesting. Actually, it seems to shrink a bit in washing. I guess the wash NTC is behind drum with these, right? The dangerous one – if it is misplaced, it’s basically a hole in the drum. Is that the only wash NTC or is there another one?

Is there a service mode to display all these NTC temps during a cycle?

It is odd that it heats up the heating unit continuously to the point that the cut-out has to kick in each time. So you think it may be that, the NTC in the heating tunnel is fine and reads the hot air but then the wash NTC inside the drum reads a low so it keeps heating the heating unit and cut-off kicks in? Similarly it boils the water too much during wash cycles due to the wash NTC reading a low…

Thank you very much!

[electrofix]

Bosch / siemans dont give access to service info so unless anyone else on here has access then your stumped

does it get too hot on wash cycle or does it seem ok ?

it could be a stuck relay feeding the element. have you checked that ?

Dave

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