Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Gain access to the incoming connections at the PCB

Measurement:

Check that the heating link between 230V OUT "L" on the white connector and "LR" with the radiator symbol on the yellow connector is present and fitted securely.
Also check the no voltage controls link is present and securely fitted on the light blue connector on the PCB.
Are both links present and securely fitted?