Set Appliance State:

Mains Power Off
CH Demand
Wait 60 seconds before powering back on as the link between the interface and
main PCB can be disrupted if it is done too soon
Gas On
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

Powering the appliance off and then on will interrupt any anti-cycle or pump overrun programs.
Apply a demand, does the Fan run?
(The fan can take up to 20 secs to start)