Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to AC Volts 
Turn Hot Water Tap On
Gain access to PCB
Use insulation mat as required
Use insulation mat as required
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Measurement:
Allow the fan to run, burner to ignite and establish
and the appliance to run with a DHW demand.
Measure the AC voltage between pin 39 (blue)
and pin 40 (brown) on connector CN6 whilst the burner is lit.
Expect mains voltage.
Turn hot water tap OFF.
As soon as the demand ends the voltage should return
to approximately 0 Vac.
Does the voltage behave as described above ?
and the appliance to run with a DHW demand.
Measure the AC voltage between pin 39 (blue)
and pin 40 (brown) on connector CN6 whilst the burner is lit.
Expect mains voltage.
Turn hot water tap OFF.
As soon as the demand ends the voltage should return
to approximately 0 Vac.
Does the voltage behave as described above ?
Isolate as per TOPs P4
and refit as necessary