quiet partner III MOD GU3200xtpq3 no longer turns on at all,

Hi @florencemadau

There's a non resettable thermal fuse¹ in the dishwasher, that if blown disconnects the power to the dishwasher.

It usually blows due to the dishwater becoming overheated so if it is blown you will have find out why this occurred. There's a high limit thermostat¹ that is supposed to operate to turn off the heater if the temp gets too hot so perhaps this may be the problem.

Here's the tech sheet for the dishwasher that will help. Once you have replaced the thermal fuse, run the diagnostic tests as shown in the tech sheet to check that it works OK.

¹ The supplier links are only to show where the parts are located, have videos for how to replace them if faulty and also show the manufacturer's part number for the part. If any parts need replacement, search online for the manufacturer's part number only to find suppliers that suit you best.