Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to AC Volts 
Boiler On/Off switch Off
Disconnect fan connector from the PCB
Disconnect fan connector from the PCB
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Measurement:
Boiler On/Off switch On.
Reset lockout if necessary.
Measure the voltage across PCB edge terminal 5 (fan connector) and neutral terminal mains input connector.
Note:
For ease of access it may be advisable to remove pump plugs from PCB. Care should be taken not to short terminals with probes.
Reset lockout if necessary.
Measure the voltage across PCB edge terminal 5 (fan connector) and neutral terminal mains input connector.
Note:
For ease of access it may be advisable to remove pump plugs from PCB. Care should be taken not to short terminals with probes.
Isolate as per TOPs P4
and refit as necessary