Set Appliance State:
Set Multimeter to DC Volts 
Turn Hot Water Tap On
Isolate Mains Power to appliance as per TOPs P4
Remove the main control box cover to expose the PCBs
Use insulation mat as necessary
Remove the main control box cover to expose the PCBs
Use insulation mat as necessary
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Measurement:
Reset lockout as necessary.
Allow fan to run and burner to ignite.
Measure voltage across connection 2 (yellow lead) and connection 3 (blue lead) on the three connection connector nearest the front of the appliance on the fan control PCB.
Expected voltage greater than 9 volt DC.
Note:
This is best done at the exposed area of the pins at the back of the connector as it comes off of the fan board.
Allow fan to run and burner to ignite.
Measure voltage across connection 2 (yellow lead) and connection 3 (blue lead) on the three connection connector nearest the front of the appliance on the fan control PCB.
Expected voltage greater than 9 volt DC.
Note:
This is best done at the exposed area of the pins at the back of the connector as it comes off of the fan board.
Isolate as per TOPs P4
and refit as necessary