Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to DC Volts 
Turn Hot Water Tap On
Remove DC electrical connector from fan assembly and make safe
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Measurement:
Reset boiler if required.
Measure the DC volts at the PCB connector X5 from each wire
listed in the table to the black wire (pin 4) on the PCB X5 connector.
Voltages should be approx. as follows:
Note:
Wires may be multicoloured.
Measure the DC volts at the PCB connector X5 from each wire
listed in the table to the black wire (pin 4) on the PCB X5 connector.
Voltages should be approx. as follows:
Note:
Wires may be multicoloured.
Isolate as per TOPs P4
and refit as necessary