Set Appliance State:
Gas Off
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to Resistance 
CH Demand
Remove the tubes from the air pressure switch (noting their locations)
Connect the APS testing kit and FGA to the APS (positive connection)
Refit APS plug at PCB if you have not already done so
Connect the APS testing kit and FGA to the APS (positive connection)
Refit APS plug at PCB if you have not already done so
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Measurement:
Ensure gas if OFF before continuing test.
When the fan begins to run increase the pressure using the APS
testing kit to the point continuity was measured on the previous test.
Does the fan now run continually?
When the fan begins to run increase the pressure using the APS
testing kit to the point continuity was measured on the previous test.
Does the fan now run continually?
Isolate as per TOPs P4
and refit as necessary