Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Refit connector X5 to the PCB
Remove the connector from the flow turbine
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

There is no need to wait for the fan purge to finish before commencing this test.
Does the display now operate?