Set Appliance State:
Set Multimeter to AC Volts 
Isolate Mains Power to appliance as per TOPs P4
Remove plastic cover from the ignition control PCB attached to the gas valve
Selector switch to hot water position
CH temperature selector to MIN
DHW temperature selector to MAX
Remove plastic cover from the ignition control PCB attached to the gas valve
Selector switch to hot water position
CH temperature selector to MIN
DHW temperature selector to MAX
| WARNING! Mains voltage is expected during test, follow TOPs P4 live testing procedure |
Measurement:
Allow fan to run.
Check for mains voltage across connection 7 (live, brown wire)
and connection 11 (neutral, blue wire) on ignition PCB.
Note:
Connections are numbered from the top (1) to the bottom (12).
Check for mains voltage across connection 7 (live, brown wire)
and connection 11 (neutral, blue wire) on ignition PCB.
Note:
Connections are numbered from the top (1) to the bottom (12).
Isolate as per TOPs P4
and refit as necessary