Set Appliance State:

Gas Off
Isolate Mains Power to appliance as per TOPs P4
Turn Hot Water Tap On
Attach a U gauge to the gas inlet pressure test point
Remove diverter valve motor from the body and make safe
Gas On
WARNING! Mains voltage is expected during test, follow TOPs P4 live testing procedure
Mains Power On

Observation:

Carry out a FGA on the appliance with it running in both its minimum and maximum output test modes as per operational procedures.
Also measure the gas inlet pressure when it is running in maximum mode.
The inlet pressure and FGA readings should be satisfactory as per the manufacturer’s instructions.
FOR GUIDANCE ON HOW TO ENTER THE MAXIMUM AND MINIMUM TEST MODES CLICK HERE