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)
Ensure No DHW demand
Ensure No DHW demand
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Measurement:
Measure the voltage between pin 5 (white) of X2 connector at the PCB to a suitable earth point.
Expected voltage approx. 5V DC.
Notes:
Ensure good connections are made.
Remember if a white PCB is fitted X2
is in a different position and pins are reversed.
Expected voltage approx. 5V DC.
Notes:
Ensure good connections are made.
Remember if a white PCB is fitted X2
is in a different position and pins are reversed.
Isolate as per TOPs P4
and refit as necessary