Set Appliance State:
Mains Power Off
Set Multimeter to AC Volts 
DHW Demand
DHW Selector in Maximum (+) position
CH Selector in Minimum (-) position
ON/OFF Switch in ON position
DHW Selector in Maximum (+) position
CH Selector in Minimum (-) position
ON/OFF Switch in ON position
| WARNING! Mains voltage is expected during test, follow TOPs P4 live testing procedure |
Measurement:
Allow self check to complete and ignition sequence to commence
Measure voltage across brown and blue wires at the spark generator located
on the left hand side of the case wall about half way up.
Expect mains voltage.
Note:
Voltage will only be present during the sparking phase of the ignition sequence.
Measure voltage across brown and blue wires at the spark generator located
on the left hand side of the case wall about half way up.
Expect mains voltage.
Note:
Voltage will only be present during the sparking phase of the ignition sequence.
Isolate as per TOPs P4
and refit as necessary