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)
Flow rate set to 3 litres/min
Flow rate set to 3 litres/min
| 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 16 (brown lead) & 17 (blue lead) of X12.
Expect mains voltage.
Is voltage measured as expected?
'O' position, then rotate back to DHW/CH position).
Allow self-check to complete.
Measure for mains voltage across pins 16 (brown lead) & 17 (blue lead) of X12.
Expect mains voltage.
Is voltage measured as expected?
