Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
1. Attach FGA to fan pressure test point
If the fan air intake is removed to attach the
FGA it must be replaced before carrying out the test

2. Disconnect wires from the safety sensor and make safe
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

Appliance will immediately enter lockout and then the
fan will run at a constant speed for 2 minutes.
Observe FGA, does it show a pressure
of -0.8mb or greater?
Note:
Reconnect wires after test. Appliance will show fault code when power is turned back on and will require resetting.