Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to AC Volts 
CH Demand
Gain access to PCB (use Insulation Mat as required)
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Measurement:
As boiler has been switched off it may light for a while, wait until
fault occurs (burner shuts off early) before continuing test.
Measure the voltage between the blue and
brown wires at CON14 on the PCB.
Is mains voltage still present?
Note:
Gas valve plug may look different (no blank pins).
It is in the same location and voltage does not change.
fault occurs (burner shuts off early) before continuing test.
Measure the voltage between the blue and
brown wires at CON14 on the PCB.
Is mains voltage still present?
Note:
Gas valve plug may look different (no blank pins).
It is in the same location and voltage does not change.
Isolate as per TOPs P4
and refit as necessary