Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to DC Volts 
DHW demand from programmer
DHW temperature selector to high setting
Ensure hot water storage vessel is calling for heat
DHW temperature selector to high setting
Ensure hot water storage vessel is calling for heat
Disconnect the plug connections from the gas valve solenoids (black leads)
Boiler On/Off switch Off
Attach multi-meter probes to the connections on one of the disconnected plugs
Boiler On/Off switch Off
Attach multi-meter probes to the connections on one of the disconnected plugs
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Measurement:
Test 1:
Boiler On/Off switch On.
Reset lockout if necessary.
Allow fan to run and ignition sequence to commence.
After approximately 30 seconds is voltage present at the connections?
Voltage will only be present for 2 to 3 seconds as burner will not ignite.
Expected voltage approximately 38 volts DC.
Test 2:
Repeat test on the other plug.
Boiler On/Off switch On.
Reset lockout if necessary.
Allow fan to run and ignition sequence to commence.
After approximately 30 seconds is voltage present at the connections?
Voltage will only be present for 2 to 3 seconds as burner will not ignite.
Expected voltage approximately 38 volts DC.
Test 2:
Repeat test on the other plug.
Isolate as per TOPs P4
and refit as necessary