Extractor Fan not extracting.

[Northern Lars]

The thermal fuse is there to protect the motor from dramatic overheating, and something fairly serious must have happened for it to fail, such as the motor being stalled. Or it was maybe faulty.
I don't think it's intended to be a serviceable part.

Can you just check with an ohmmeter that there's no resistance from the motor white wire to the other wires?

If not you need a need a new motor ?

Ok, ohmmeter gives infinite resistance between the white and other wires.

So that means the motor is kaput..?

I can order a new one for not too much, but I just want to be sure the same won't happen again.

When I started fixing the problem, I started with the motor, then the capacitor. Is it likely the capacitor was the component at fault, and this indeed fried the new motor due to the power being on with no rotation, causing an overheat? So if I replace the motor, with the capacitor now working, there should be no more problem?

 

[Avo Mk8]

Ok, ohmmeter gives infinite resistance between the white and other wires.

So that means the motor is kaput..?

I can order a new one for not too much, but I just want to be sure the same won't happen again.

When I started fixing the problem, I started with the motor, then the capacitor. Is it likely the capacitor was the component at fault, and this indeed fried the new motor due to the power being on with no rotation, causing an overheat? So if I replace the motor, with the capacitor now working, there should be no more problem?

I fear the motor is indeed kaput. Wikipedia has a little on the thermal fuse, which might be of interest.

Thermal cutoff - Wikipedia

en.wikipedia.org

It is possible the new motor could have been kaputted by the original capacitor being faulty.
If you still have that original capacitor, have you tried putting an ohmmeter across it? Should read open, but you might see a reading of quickly increasing value, and if you swap the probes over, see that again. That's a sign it might be at least sort of OK.
If it reads short circuit, obviously faulty. If it doesn't show any sign on the meter when you do the above, also possibly faulty.
Note the above is a really crude and unreliable check, but might give an idea of what happened.

On the other hand, if you have a snazzy multimeter which measures capacitance, you can measure it! Although it's possible the capacitor could still be breaking down when in circuit.
Defo don't use the original capacitor ?

I hope replacing the motor and using the more recent capacitor will solve the problem - good luck ?

 

[Northern Lars]

I fear the motor is indeed kaput. Wikipedia has a little on the thermal fuse, which might be of interest.

Thermal cutoff - Wikipedia

en.wikipedia.org

It is possible the new motor could have been kaputted by the original capacitor being faulty.
If you still have that original capacitor, have you tried putting an ohmmeter across it? Should read open, but you might see a reading of quickly increasing value, and if you swap the probes over, see that again. That's a sign it might be at least sort of OK.
If it reads short circuit, obviously faulty. If it doesn't show any sign on the meter when you do the above, also possibly faulty.
Note the above is a really crude and unreliable check, but might give an idea of what happened.

On the other hand, if you have a snazzy multimeter which measures capacitance, you can measure it! Although it's possible the capacitor could still be breaking down when in circuit.
Defo don't use the original capacitor ?

I hope replacing the motor and using the more recent capacitor will solve the problem - good luck ?

The original capacitor is long gone, and I have a cheap and cheerful £8 multimeter, so no capacitance measurement there!

Got a new motor on order, will let you know how I get on when it arrives. Thanks for all the help!

 

[Northern Lars]

Motor arrived today, installed it and she's purring away happily. I can now fry with confidence again!

Thanks again for all the help!