Set Appliance State:
Set Multimeter to AC Volts 
Turn Hot Water Tap On
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:
Measure voltage across connection 10 (live, brown wire)
and connection 11 (neutral, blue wire) on ignition PCB.
Note:
Connections are numbered from the top (1) to the bottom (12).
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