Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Turn Hot Water Tap ON
DHW Temperature Control to MAX
Attach pressure gauge to fan pressure test point
Unclip Diverter Valve head from the body and leave in a safe position
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Measurement:

Reset appliance if required (press and hold
reset button for 5 seconds then release).
Operate boiler at maximum output.
CLICK HERE FOR INSTRUCTIONS
Fan pressure will read negative and should
be in the white area of the table
Notes:
1. The pressure measured will be negative.
2. When pressure gauge is removed,
pressure test cap must be replaced.