Set Appliance State:
Mains Power Off
Set Multimeter to AC Volts 
Turn Hot Water Tap On
Use Insulation Mat as required
Selector switch to hot water
Locate the short harness connecting J2 (black connector) on the main pcb to J1 (black connector) on the ignition pcb
Selector switch to hot water
Locate the short harness connecting J2 (black connector) on the main pcb to J1 (black connector) on the ignition pcb
| WARNING! Mains voltage is expected during test, follow TOPs P4 live testing procedure |
Measurement:
Measure voltage at the brown wire (closest to the front when the control panel is lowered) at J1 on the ignition pcb and a suitable neutral.
Mains voltage expected.
Mains voltage expected.
Isolate as per TOPs P4
and refit as necessary