Re: Whirlpool ADP731 d/w
I *think* from memory that these has a re-set safety thermostat on top of the heater tube – it may have clicked out. They were also prone to the wiring burning out on the heater circuit.
The thumping noise may point to a circulation problem – poor circulation will cause the heater safety to trip out. I would suggest that you set the machine off on the rinse programme. After circulation starts, pop the door open and you will should spot the rotors stopping with water spraying out of them. Worn pivot bushes and blocked rotors (especially the tips) can cause all sorts of problems.
A few things to think about – stay safe if you intend to try and solve this yourself – plug out before opening up.
Penguin45.