Miele T8722 Tumble Dryer Not Heating Up...

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Our tumble dryer has developed a fault in the last couple of days. It is not producing hot air.

I've taken the back off and tested the thermostat with a multimeter and it is fine. Is there anything else I could check?

Thanks...

MJ
 
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Did you test the element while you were there, or is that one of the gas models.
 
I didn't test the element. I managed to test the thermostat from reading various threads on here, but how would I go about testing the element? Where is it located?

I'm pretty sure it's not gas...

TIA
 
At the back is a thermal cut out and an NTC sensor right?

I had a problem where the thermal cut-out needed banging to reset it and it was then fine.

If you turn it off,
Hold down the start button
Turn it on and while the start is held down
Press start 3 times and hold....

Does this machine go into service mode?
You cycle through the options with the dial and to exit turn it off.

I have a washing machine whose diagnostic menu is accessed in the same manner.
 
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At the back is a thermal cut out and an NTC sensor right?

I had a problem where the thermal cut-out needed banging to reset it and it was then fine.

If you turn it off,
Hold down the start button
Turn it on and while the start is held down
Press start 3 times and hold....

Does this machine go into service mode?
You cycle through the options with the dial and to exit turn it off.

I have a washing machine whose diagnostic menu is accessed in the same manner.

Tried to run the diagnostics, but nothing happened. Are you sure it should work on my model?
 
Here is a view showing the element & other heater sensors http://www.partmaster.co.uk/tumble-dryer/miele/t8722/catalogue.pl?path=67146,108693:128236&model_ref=2507305&illustration_ref=2299900 you need to test for continuity across the element connections. You also need to ensure there is no obstructions to the air being vented out of the machine ( blocked pipe, vent, filter, etc)

Thanks. That was a good help.

I have tested the element and it is showing 92ohms. Is that good or bad? I've got access to the thermal limiter sensor, but how do I test that and what should be the correct reading?
 
That should be OK. The ntc sensor resistance should vary with temperature, so attach your meter across it & check the resistance rises & falls as you blow a hairdryer across it.
 
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Just managed to snag the last one at Amazon http://www.amazon.co.uk/appliances/dp/B00I5RNE44 for £47. I have prime, so it will be here tomorrow and I'll let you know if it works!

Fingers crossed! I'll be over the moon if I've managed to fix this with help in this thread. I was dreading a bill of about 200+ quid to get the dryer working again...
 
Good luck, but Curry's would do it for £119 fixed fee, not quite £200;)
 
Part arrived. Tried it and no joy! Still the same. I then realised I had been measuring it wrong. When I measured the thermostat and element, I had the multimeter on the lowest ohm setting (200) and it showed readings for both. ~0.04 and ~92 accordingly.

When I measured the NTC, it didn't show any reading at all, so I assumed it was faulty. When the new one arrived and didn't give any readings too, I thought something else was wrong. So I changed the multimeter setting to 2000K setting and I finally got a reading of ~130ohms. I dipped it in warm water and it went down to ~60, so does that sound correct? I noticed it was the same or similar reading as the person who I linked to in post number 9 above...

Stumped now. Looks like a call to Currys is forthcoming!
 
Update:

Just tried drying a pair of jeans on a 'Extra dry' cycle (with original NTC sensor) and they dried!

The only other thing left to check is the electronic unit. Does that sound like a symptom of a faulty unit?
 
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Your NTC sensor seems to be OK ( both of them if you are getting the same readings ) are you sure the element is not in 2 sections & half is working & half not, could you post a pic of the element showing the terminals? It seems strange to work in one programme & not another.
 
If you look at the 2 pictures in the link in post number 9, that is pretty much identical to mine.

The blue plug is the element, which give about 90ohms. The black plug is the thermostat, which routes via the element (you can just about make out 3 wires going into the back box) and this measures 0.7ohms. The little white plug is the NTC sensor and this measures 130 or 13k ohms.

That's everything and seemingly all normal readings... I've managed to find a electronic unit on ebay for £25 delivered (beats Miele's asking price of £111) so hopefully THAT will sort it! Pleeeeeeeeeeeeeeeeeeease!!!
 

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