Indesit machine thinks it's full

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So my indersit has decided the cold weather was too much for it. When it's supply pipes thawed out today (it's in a garage) I put it on and when I came to remove the washing, it was sodden.

I cleared the drainage filter, pump and hose to check there was no problem there.

Put it on again, and now it won't fill. It gets stuck on the initial drain.

The drain is working, but the machine thinks it isn't. Here's what I've done to confirm that.

Put four litres of water in the drum, place drainage hose in bucket above machine.
Start cycle.
Draining pump works immediately and pumps all the water out with no problem.
The drainage pump doesn't stop and keeps going for a few minutes. It eventually gives up, but then the machine won't draw any water, apparently because it thinks it's been unable to drain.

I therefore think it's either the pressure switch or the pcb.

So my questions are
(a) is that a reasonable diagnosis?
(b) is there a way to tell which it is (other than buying new ones of both)?
(c) Have I missed something?
 
i would be tempted to turn it off at the mains and warm it up to perhaps 15 degrees for maybe a few hours to drive out the damp and try again
 
jj4091 - Spin cycle works entirely as expected, including the draining at the end. What does this mean?

big-all - sounds like a good idea. I'll bring it inside for some warmth and tlc later. Cheers!
 
It means the motor brushes are OK. You could try removing the pipe from the pressure switch & blowing down it in case there is a blockage at the pump end. I'm not sure if your pressure sensor is just a open/closed switch or an electronic device so cannot advise on how to test. If you can blow into it & hear a clicking noise as it actuates & de-actuates then the chances are it is a switch that you can just do a resistance check on.
 
Try cleaning the sump, grease accumalated there can trigger the pump and because it cannot be shifted machine will not then take on any more water.
 
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