Hotpoint BHWM149 – weird fault – drain then fill then drain continually

The customer complained of machine not filling up with water to correct level and seems to produce a lot of lather. I checked it over and couldn’t find anything amiss except that there is a bit of lather even though no detergent in drawer. I thought maybe some residual detergent pod is stuck somewhere in the drum. I cleaned out the drain pump using the wet vac, no debris found just completely clean.

proceeded to put in detergent remover powder and put on hot wash to shift that that potential stuck detergent pod. The machine starts up, briefly drained then fill for few seconds and prompted to drain out. The door lock won’t release without the3 emergency release.

Checked the main pcb module, nothing unusual although it was repaired previously by EMW to remove the slug and restored it but that was a year ago. This machine has a induction motor.

Owner appear to assume that it was her relations who stayed in the house while on holiday may have done something to do with it such as overloading, etc.

I am a bit puzzled. Tried replacing the interlock and no avail, it got to be something along with failed triac if that is what I am thinking?

Any word of wisdom would be greatly appreciated in my direction?

Thanks Matt