Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to AC Volts 
Gain access to PCB (use Insulation Mat as required)
Selector switch to DHW position
Selector switch to DHW position
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Measurement:
Measure voltage across connection 2 (orange wire) on connector CN7 on the main PCB and a suitable neutral.
Note: On some PCB's the connector will be labelled as CON4 not CN7, however the test points and the colours of the wires stated remain the same.
Note: On some PCB's the connector will be labelled as CON4 not CN7, however the test points and the colours of the wires stated remain the same.
Isolate as per TOPs P4
and refit as necessary