Set Appliance State:

Turn Hot Water Tap On
Ensure plate heat exchanger is cool, this can be done by running the hot tap with the appliance switched off.
Gas On
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

Reset lockout if necessary.
Allow fan to run and ignition sequence to commence.
Allow burner to ignite and establish.
After approximately 5 seconds does the fan speed increase?