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richard here ,just had customer ring about this model for monday call.she say in the wash program its overheating badly,with steam coming from the soap box,it has also buckled the soap drawer.any ideas b4 i go monday,ta eng 14
Re: miele novatronic wt945
check heater relay isnt jammed closed, ntc, loom. failing that replace board
btw if you didnt know all miele machines have a circuit diagram in them usually behind control panel.
Re: miele novatronic wt945
i may sound stupid but 25 years doing this and i have to ask u what u mean by ntc please reply asap or 07901822176,ta richard
Re: miele novatronic wt945
ntc = negative temperture coeffient (temperture sensor that changes resistance with temperture change, similar to a thermistor)
u can have ptc’s as well but they arent very common.
Re: miele novatronic wt945
jeremy wrote:ntc = negative temperture coeffient (temperture sensor that changes resistance with temperture change, similar to a thermistor)
u can have ptc’s as well but they arent very common.
I thought thermistor ntc and ptc were all thermistors ❓
Is the thing in a fridge relay a ptc or an ntc ❓
I’ve been in this trade for some time too but I think it’s useful to pick the brains of people fresh out of college who haven’t had time to forget the “useless” stuff. (And the brains of the old boys who haven’t given up yet and become astranouts in Spain).Re: miele novatronic wt945
leavemetogetonwithit wrote:I thought thermistor ntc and ptc were all thermistors ❓
They are essentially 🙂
NTC means that as the enviromental temperature around the thermistor rises the electrical resistance decreases, and vise versa, mainly used for temperature sensing on appliances.
PTC does the opposite. In refrigeration they are used as compressor start devices but are still refered to as “relays” quite often even though they are nothing of the sort. The “disk” (thermistor) inside the start device heats up as it supplies power to the start winding (high current) and as this happens the resistance increases to such an extent it becomes virtually open circuit thus stopping power reaching the start windings inside the compressor. The run winding is permanently powered throughout leaving it running after the start winding has the power removed. As they are permanently “hot” is the reason we see such a relatively high failure rate. Basically a replacement for an electrolytic start capacitor (someone else can explain that one :lol:)
Dave.
Re: miele novatronic wt945
3493494 is the relay part number priced at £35 ish, this appliance is a Washer Dryer by the way.
Re: miele novatronic wt945
…..NTC means that as the enviromental temperature around the thermistor rises….. Dave.
Ah hah! Obviously the reason we get so much trouble with these things these days. It MUST BE global warming 😆
Mike.Re: miele novatronic wt945
is it the probe in the heater,similar to hotpoint ones richard,would this cause a boiler as i put them richard
Re: miele novatronic wt945
You could measure the resistance of it and if it is same as hotpoint one in dimensions and resistance try a hpt one in its place. Often though it can be just the connector which is not making good contact. Worth checking that first as it doesn’t take time. Also connector at module end if you can find it.
To check thermistor operation put a little water in drum, just enough to cover element (with front of m/c swung open). Use a seperate mains lead to power the element whilst having your meter connected by croc clips to ntc terminals. Monitor change in resistance as temp rises. Alternatively, just loosen grommet, pull out ntc and check it in your tea. These methods are no guarantee though as the things can be intermittent.
Mike.
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