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 if required (rotate selector switch to
'O' position, then rotate back to DHW/CH position).
Allow self-check to complete.
Measure for mains voltage across pins 20 (brown) and 19 (blue) of connector X12.
Is mains voltage present?
Note:
Appliance may enter lockout during test , reset appliance as required until test complete.
'O' position, then rotate back to DHW/CH position).
Allow self-check to complete.
Measure for mains voltage across pins 20 (brown) and 19 (blue) of connector X12.
Is mains voltage present?
Note:
Appliance may enter lockout during test , reset appliance as required until test complete.
Isolate as per TOPs P4
and refit as necessary