Whirlpool WDT540HAMZ dishwasher will not start or respond

The checks in more detail

Open it and close it firmly until it clicks; a door that is only partly shut keeps the machine from starting, and a utensil or a rack edge in the latch path stops it. On a model with a hidden console the status lights are on the top edge, so watch the lights on the top edge as you close the door. Choose a cycle and press Start, and then close the door if the instructions say the cycle begins when the door shuts, since some Whirlpool models start the countdown only after a short delay.

Then settings. A Control Lock, which disables the keys, will stop a cycle from starting; hold the lock key for a few seconds to turn it off. A Delay Start waits for the chosen time before beginning; cancel it if you want an immediate cycle. Check whether the machine thinks it is already finished: the lights may show a Clean light from the previous cycle until you open and close the door. Then power.

Check the household breaker, and if the machine is plugged in under the sink or wired through a switch, check the switch is on. If the lights are dead, switch off at the breaker for a minute and restore power. If the machine still will not start with power, a latched door, no lock and no delay, the door latch switch or the control may have failed, which a technician can test. Quote WDT540HAMZ and the serial number from the door label. Do not bypass the door switch.