Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to DC Volts 
Gain access to PCB (use Insulation Mat as required)
Measure the voltage between
Measure the voltage between
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Measurement:
Test 1:
Measure the voltage between the red wire at CN8 connector on the PCB to a suitable earth point.
Voltage should be approximately 28V DC.
Test 2:
Measure the voltage between the orange wire at CN8 connector on the PCB to a suitable earth point.
Voltage should fluctuate between 0V and 2V DC.
Measure the voltage between the red wire at CN8 connector on the PCB to a suitable earth point.
Voltage should be approximately 28V DC.
Test 2:
Measure the voltage between the orange wire at CN8 connector on the PCB to a suitable earth point.
Voltage should fluctuate between 0V and 2V DC.
Isolate as per TOPs P4
and refit as necessary