Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to DC Volts 
Turn Hot Water Tap On
DHW temperature control to maximum
CH temperature control to minimum
DHW temperature control to maximum
CH temperature control to minimum
Unplug the ignition PCB from the gas valve and turn the PCB around to expose
the rear connecting pins
Use insulation mat as required
the rear connecting pins
Use insulation mat as required
| WARNING! Mains voltage is expected during test, follow TOPs P4 live testing procedure |
Measurement:
Allow the fan to run and the ignition sequence to commence.
Measure voltage between the top and bottom pins on the rear of the ignition PCB.
Expected voltage approximately 230V DC.
Measure voltage between the top and bottom pins on the rear of the ignition PCB.
Expected voltage approximately 230V DC.
Isolate as per TOPs P4
and refit as necessary