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 set to Max
Thermostat set to Max
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Observation:
Measure voltage across the terminals of the main gas solenoid
(red and blue wires) to the earth connection.
Test 1:
Measure the voltage across the live (red 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.
(red and blue wires) to the earth connection.
Test 1:
Measure the voltage across the live (red 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.
