Set Appliance State:
Set Multimeter to DC Volts 
Isolate Mains Power to appliance as per TOPs P4
Gain access to PCB (use insulation mat as required)
Ensure no demands
Attach air pressure switch test kit and FGA to P1 on APS
Gain access to PCB (use insulation mat as required)
Ensure no demands
Attach air pressure switch test kit and FGA to P1 on APS
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Observation:
Ensure the pressure reads 0mb.
Measure the voltage between pin 10 (grey)
and pin 11 (orange) at M3 on the PCB.
Voltage should be as per the table.
Repeat this test after adjusting the pressure to 1.5mb and again at 3.0mb.
Note:
Some or all of the pink wires on M3 may not be present
depending on the exact model you are working on.
Pressure may increase very quickly be careful not to over pressurise.
Measure the voltage between pin 10 (grey)
and pin 11 (orange) at M3 on the PCB.
Voltage should be as per the table.
Repeat this test after adjusting the pressure to 1.5mb and again at 3.0mb.
Note:
Some or all of the pink wires on M3 may not be present
depending on the exact model you are working on.
Pressure may increase very quickly be careful not to over pressurise.
Isolate as per TOPs P4
and refit as necessary