Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Set Multimeter to DC Volts Set meter to measure DC Volts
Remove 1 connector from overheat stat and make safe
Remove fan control connector from fan assembly and make safe
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Measurement:

Measure for DC voltage across pin 13 connector X20 and a suitable earth connection.
Expected voltage approximately 8.0 Vdc or greater.
Note.
Reset appliance as required until test complete.