Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to AC Volts 
Gain access to PCB (use Insulation Mat as required)
Heating temperature selector to OFF
Hot water temperature selector to maximum
Ensure heatbank is not up to temperature (this can be achieved by running the DHW with the mains power to the appliance on and the pilot switched off)
Heating temperature selector to OFF
Hot water temperature selector to maximum
Ensure heatbank is not up to temperature (this can be achieved by running the DHW with the mains power to the appliance on and the pilot switched off)
| WARNING! Mains voltage is expected during test, follow TOPs P4 live testing procedure |
Measurement:
Measure voltage across connection 1 (pump live, brown wire) and connection 3 (pump neutral, blue wire) on connector marked X10 on the PCB.
Isolate as per TOPs P4
and refit as necessary