Set Appliance State:
Mains Power Off
Gas Off
CH switch OFF
Ensure secondary heat exchanger is cool and requires pre-heat (this can be achieved by running the DHW with the gas to the appliance turned off)
Pre-heat switch ON
Ensure secondary heat exchanger is cool and requires pre-heat (this can be achieved by running the DHW with the gas to the appliance turned off)
Pre-heat switch ON
Mains Power On
Observation:
Does fan run?
