Set Appliance State:

Mains Power Off
Turn Hot Water Tap ON
DHW Temperature Control to MAX
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

Allow burner to ignite and establish.
Using a FGA check for any fumes
near the burner seal and the flue
seals for the appliance.
Also inspect visually for any signs of
corrosion or staining.