Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to AC Volts 
Turn Hot Water Tap On
Use Insulation Mat as required
Gain access to PCB
Selector switch set to CH/DHW position
Boiler DHW thermostat set to MAX
Gain access to PCB
Selector switch set to CH/DHW position
Boiler DHW thermostat set to MAX
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Measurement:
Measure the AC voltage between pin 1 (brown)
and pin 2 (blue) on connector CN2.
Expect mains voltage.
and pin 2 (blue) on connector CN2.
Expect mains voltage.
Isolate as per TOPs P4
and refit as necessary