Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to AC Volts 
Turn Hot Water Tap On
Gain access to PCB (use Insulation Mat as required)
Selector switch to DHW position
CH temperature selector to Min
DHW temperature selector to Max
Selector switch to DHW 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 and ignition sequence to commence.
Measure the voltage at connection 1 live (blue wire, numbers run right to left) and connection 3 neutral (red wire) connector M3 on the ignition PCB.
Note:
Voltage will only be present during sparking phase of ignition sequence if burner does not ignite.
Both black and red connections are neutral wires, blue is live.
Measure the voltage at connection 1 live (blue wire, numbers run right to left) and connection 3 neutral (red wire) connector M3 on the ignition PCB.
Note:
Voltage will only be present during sparking phase of ignition sequence if burner does not ignite.
Both black and red connections are neutral wires, blue is live.
Isolate as per TOPs P4
and refit as necessary