Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Gain access to the PCB (use insulation Mat as required)
Remove the DC pump connector from the PCB and make safe
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

Does the Pump now run?
Note:
Do not take sound or vibration as a sign of the pump running.