Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to AC Volts 
CH Demand
Gain access to PCB (use insulation mat as necessary)
Pull connector X1 back slightly to expose test points
Pull connector X1 back slightly to expose test points
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Measurement:
Measure the voltage between pin 2 (black) and
pin 4 (blue) at connector X1 on the PCB.
Mains voltage should be present.
pin 4 (blue) at connector X1 on the PCB.
Mains voltage should be present.
Isolate as per TOPs P4
and refit as necessary