Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to AC Volts 
DHW Demand
CH Demand
Remove cover from the Pump wiring box.
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Measurement:
Measure the voltage across the live (L) and neutral (N) of the pump.
Is mains voltage measured?
Note: The colour and position of the wires will vary
between systems and components.
Is mains voltage measured?
Note: The colour and position of the wires will vary
between systems and components.
Isolate as per TOPs P4
and refit as necessary