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:
Reset appliance as necessary.
Allow burner to light and establish.
Measure the voltage between pins 1 and 2
(black and blue wires) on J3 connector at the control PCB.
Mains voltage expected.
Allow burner to light and establish.
Measure the voltage between pins 1 and 2
(black and blue wires) on J3 connector at the control PCB.
Mains voltage expected.
Isolate as per TOPs P4
and refit as necessary