Hotpoint CTD85/31358 Condensor Dryer

[mike412]

An engineer colleague of mine has the above machine in workshop.
Problem is not heating. One of the thermostats was o/c and replacing has got it heating again but only for two minutes. At that point a relay on the board operates and it stops heating and will not come back on.
Any ideas?. I suspect the board but has anyone had this fault before?.

Regards, MIKE.

[Dave_Conway]

Re: Hotpoint CTD85/31358 Condensor Dryer

There’s some technical blurb on this model on Partfinder about replacing the thermostats and thermistors as a kit which seems more likely.

Serial number required to identify the correct one, 31358 is too short ?

Dave.

[Martin]

Re: Hotpoint CTD85/31358 Condensor Dryer

Remember that when testing electronic sensor dryers, you need to run it with damp clothes in otherwise the heating will shut down after a few short minutes 😉

[mike412]

Re: Hotpoint CTD85/31358 Condensor Dryer

thanks for the response guys.

31358 is not the serial number, this is the “creda” type number off the back panel.
The serial number is 501250136.
The original fault code was F10, which I suspect is “Heater Fault”.
but now, even with a load of damp clothes it still will not heat, and as a further development, it now shows F03.

Any assistance greatly appreciated.

Cheers, Mike.

[iadom]

Re: Hotpoint CTD85/31358 Condensor Dryer

F10 is heater, common open or one shot device OC.
F03 is front NTC open or short circuit.

This info is from VTD65 but codes are the same, there are two thermistors one at the front and one at the back.

Manual also says that if changing NTC does not cure fault the module is faulty. 😥

Just checking on Partfinder the front thermistor appears to be situated around the same place the stat was on earlier models.

Also two different ones, before date code 51, part is a 1702790, not interchangable with later one.

[mike412]

Re: Hotpoint CTD85/31358 Condensor Dryer

Thanks for prompt response Iadom.

We have checked the value of both front and rear thermistors which both read about the same 650k which does seem a bit high, but it is also illogical that both would fail at the same time. do we know what the thermistor value should be?. Also can Dave furnish us with the part number for the Stat kit for this model, or are we talking about the rear panel kit as previously indicated?. Also just in case what is the part number for the PCB?.

Many Thanks,

Mike.

[Dave_Conway]

Re: Hotpoint CTD85/31358 Condensor Dryer

The kit is 1703607 which is either just the two stats on the heater or the two stats plus the rear thermistor, it’s not clear from the picture although the text indicates it’s all three 😕

The PCB is 1703286 (superseded kit) you will also need eeprom part number 1703567 as it now comes without one.

Dave.

[mike412]

Re: Hotpoint CTD85/31358 Condensor Dryer

Thanks for this info Dave.

Anyone got any ideas on what these thermistors should be reading?. Would the m/c fault code F03 if the thermistor was high, or only if it was short or open?

Regards, Mike.

[iadom]

Re: Hotpoint CTD85/31358 Condensor Dryer

Value of both thermistors at room temp(20°) is 500KΩ

[mike412]

Re: Hotpoint CTD85/31358 Condensor Dryer

Many Thanks Iadom.

This is rapidly looking like a pcb problem!.

Regards,
Mike.

[iadom]

Re: Hotpoint CTD85/31358 Condensor Dryer

Verbatim from tech info.

F03. Front NTC open or short circuit.

Verify efficiency of the J12 connector on the board.

Verify NTC on J12 connector, the value at room temp of NTC is approx 500 KΩ

If the measurement is out of range verify continuity of wiring and verify directly onto NTC without wiring.

Replace NTC.

Replace main board. 😥

[mike412]

Re: Hotpoint CTD85/31358 Condensor Dryer

Many thanks Iadom,

All useful info, thanks for the time and trouble you have taken.

Regards,
Mike.

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