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
Selector switch set to CH/DHW position
Selector switch set to CH/DHW position
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Measurement:
Allow the fan to run.
Test 1.
Measure the AC voltage between pin 3 blue (Neutral) on connector CN1
(black probe) and pin 2 (blue) on connector CN6.
Test 2.
Measure the AC voltage between pin 3 blue (Neutral) on connector CN1
(black probe) and pin 1 (brown) on connector CN6.
On both tests expect voltage of between approximately 190 - 240 Vac.
Note:
The appliance may go to lockout, reset as required until the test is complete
Test 1.
Measure the AC voltage between pin 3 blue (Neutral) on connector CN1
(black probe) and pin 2 (blue) on connector CN6.
Test 2.
Measure the AC voltage between pin 3 blue (Neutral) on connector CN1
(black probe) and pin 1 (brown) on connector CN6.
On both tests expect voltage of between approximately 190 - 240 Vac.
Note:
The appliance may go to lockout, reset as required until the test is complete
Isolate as per TOPs P4
and refit as necessary