Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Remove electrical connectors to the following & make safe;
  • Fan assembly (low voltage)
  • Gas valve
  • Diverter Valve motor
    • WARNING! - Mains voltage is expected during test follow
    TOPs P4 live testing procedure
    Mains Power On

    Observation:

    Does the display now operate correctly? (see note)
    Note.
    If display operates correctly leave electrical connectors disconnected for next test.