Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to AC Voltage 
Turn Hot Water Tap On
Remove connector marked CON 1 on PCB 37
| 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 across the pin on PCB 37 CON 1 (marked DET) to the mains neutral.
Measure the voltage across the pin on PCB 37 CON 1 (marked DET) to the mains neutral.
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Isolate as per TOPs P4
and refit as necessary