Set Appliance State:
Mains Power Off
Set Multimeter to AC Volts 
Turn Hot Water Tap On
Selector switch set to CH/DHW position
Boiler DHW thermostat set to MAX
Boiler DHW thermostat set to MAX
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Measurement:
Allow fan to run and ignition sequence to commence.
Measure the AC voltage between the gas valve modulating
solenoid terminals during the ignition phase.
Expect approximately 10 Vac.
Note:
The appliance may go to lockout, reset as required until the test is complete.
Measure the AC voltage between the gas valve modulating
solenoid terminals during the ignition phase.
Expect approximately 10 Vac.
Note:
The appliance may go to lockout, reset as required until the test is complete.
Isolate as per TOPs P4
and refit as necessary