Set Appliance State:
Mains Reset Switch OFF
Set Multimeter to DC Volts 
Isolate Mains Power to appliance as per TOPs P4
Ensure the boiler is cool so that there is demand for preheat
Set DHW temperature selector to ECO
Place multimeter probes on the gas valve connections +ve
lead to grey lead -ve lead to white connection
Ensure the boiler is cool so that there is demand for preheat
Set DHW temperature selector to ECO
Place multimeter probes on the gas valve connections +ve
lead to grey lead -ve lead to white connection
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Measurement:
Mains reset switch On.
Allow fan to run and ignition sequence to commence.
After approximately 25 seconds is voltage present across the
connections of the gas valve?
Expected voltage approximately between 12 and 26 Volts DC.
Note:
Voltage will only be present for 2 to 3 seconds if burner does not ignite.
Allow fan to run and ignition sequence to commence.
After approximately 25 seconds is voltage present across the
connections of the gas valve?
Expected voltage approximately between 12 and 26 Volts DC.
Note:
Voltage will only be present for 2 to 3 seconds if burner does not ignite.
Isolate as per TOPs P4
and refit as necessary