Rear NTC open or short circuit.
Err, at the rear, behind the small back panel.
The thermostats and NTC should be changed as a complete kit, two different types, one with a white NTC and one black.
I would also remove the condensor from the bottom of the machine at the front. This should be cleaned out every week or so, if it is badly clogged up then that will lead to stat/ntc failure.
Be sure to remove the mains plug before removing any panels.
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