Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to AC Volts 
DHW Demand
Gain access to PCB (use Insulation Mat as required)
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Measurement:
Press reset to cancel purge cycle countdown.
Allow fan to run and ignition sequence to commence.
Measure the voltage across connection 1 (Live) and 2 (Neutral) at connector X9 on the PCB.
X9 connections are numbered 1-3 from left to right.
Expected voltage 60-70 VAC.
If lockout occurs reset as necessary and continue.
Allow fan to run and ignition sequence to commence.
Measure the voltage across connection 1 (Live) and 2 (Neutral) at connector X9 on the PCB.
X9 connections are numbered 1-3 from left to right.
Expected voltage 60-70 VAC.
If lockout occurs reset as necessary and continue.
Isolate as per TOPs P4
and refit as necessary