Set Appliance State:
Gas Off
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to AC Volts 
Gain access to pump wiring
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Measurement:
Allow boiler self check to complete.
Hold down the service mode button for more than 5 seconds to
enable service mode.
Measure the voltage across L and N terminal connections on the pump.
Mains voltage expected.
Note:
Pump is located external to appliance.
Wiring may differ to example shown.
Hold down the service mode button for more than 5 seconds to
enable service mode.
Measure the voltage across L and N terminal connections on the pump.
Mains voltage expected.
Note:
Pump is located external to appliance.
Wiring may differ to example shown.
Isolate as per TOPs P4
and refit as necessary