Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to AC Volts 
CH Demand
Gain access to gas valve connections
Thermostat turned to Max
Thermostat turned to Max
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Observation:
Allow the Fan to start.
Test 1:
Measure the voltage across the live (orange lead) and the Earth terminal on the main connector block at the front of the control box.
Test 2:
Measure the voltage across the neutral (blue lead) and the Earth terminal on the main connector block at the front of the control box.
Test 1:
Measure the voltage across the live (orange lead) and the Earth terminal on the main connector block at the front of the control box.
Test 2:
Measure the voltage across the neutral (blue lead) and the Earth terminal on the main connector block at the front of the control box.
