Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Gain access to PCB (use Insulation Mat as required)
Remove connector X3 from display PCB and leave in a safe place
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

Does the pump now run?
Note.
1. No demand is required for this test.
2. Do not take sound or vibration as a sign the pump is running.