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 fan to run and burner to ignite and establish.
Monitor the voltage between pin 2 (brown) and pin 3 (blue) on connector J2 at the control PCB.
When the burner extinguishes is mains voltage still present, or does it disappear or lower as the burner extinguishes?
Note:
Voltage change may only be brief. Repeat test as required.
Monitor the voltage between pin 2 (brown) and pin 3 (blue) on connector J2 at the control PCB.
When the burner extinguishes is mains voltage still present, or does it disappear or lower as the burner extinguishes?
Note:
Voltage change may only be brief. Repeat test as required.
Isolate as per TOPs P4
and refit as necessary