Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
CH Demand
Attach a pressure gauge to the burner pressure test point
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Measurement:

Measure the burner pressure as the appliance operates.
The burner pressure should be set as per the appliance data badge.
Is the burner pressure set correctly?
Note:
When pressure gauge is removed the pressure test
point should be tightened and checked for gas tightness.
BURNER PRESSURE SET CORRECTLY
BURNER PRESSURE TOO LOW
BURNER PRESSURE EXCESSIVE