Set Appliance State:
Mains Power Off
Set Multimeter to AC Voltage 
CH Demand
Ensure that the Boiler Thermostat is set to MAX
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Measurement:
Allow the fan to run and the pilot to ignite.
Measure the voltage across the blue spaded wire and the white spaded wire on the main gas valve solenoid.
Note:
Wires from gas valve removed for clarity but test should be completed with them connected to the gas valve.
Measure the voltage across the blue spaded wire and the white spaded wire on the main gas valve solenoid.
Note:
Wires from gas valve removed for clarity but test should be completed with them connected to the gas valve.
Isolate as per TOPs P4
and refit as necessary