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)
| 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 for AC voltage across pins 69 & 70 on connector CN12 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 for AC voltage across pins 69 & 70 on connector CN12 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