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
Preheat OFF
Preheat OFF
| 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 X8 on the
harness from each wire listed in the table to the
black wire (pin 3) on the PCB X8 connector.
Voltages should be approx. as follows:
Note: To ensure a good connection is made use the small test points on the PCB just below the connector.
Measure the DC volts at the PCB connector X8 on the
harness from each wire listed in the table to the
black wire (pin 3) on the PCB X8 connector.
Voltages should be approx. as follows:
Note: To ensure a good connection is made use the small test points on the PCB just below the connector.
Isolate as per TOPs P4
and refit as necessary