Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to DC Volts 
Ensure there is no demand for either CH or DHW
Gain access to PCB (use insulation mat as necessary)
Gain access to PCB (use insulation mat as necessary)
| WARNING! Mains voltage is expected during test, follow TOPs P4 live testing procedure |
Measurement:
At connector JP1 on the PCB measure the voltage between
the 1 Pink and 4 Black wire.
The Voltage should be approximately 35VDC
the 1 Pink and 4 Black wire.
The Voltage should be approximately 35VDC
Isolate as per TOPs P4
and refit as necessary