Set Appliance State:
Gas Off
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to DC Volts 
Gain access to PCB (use Insulation Mat as required)
NO Demands
NO Demands
| WARNING! Mains voltage is expected during test, follow TOPs P4 live testing procedure |
Measurement:
Test 1:
Measure the DC voltage between Pin 12 (Green) on X25 and a suitable earth. Expect approximately 1.4 Vdc.
Test 2:
Turn Hot Water Tap On.
Allow fan to run.
Measure the DC voltage as above again.
Expect approximately 2.5 Vdc or greater.
Notes:
1. Each pin on the PCB connector is numbered.
2. Appliance may lockout during test, reset as necessary until result is confirmed.
Measure the DC voltage between Pin 12 (Green) on X25 and a suitable earth. Expect approximately 1.4 Vdc.
Test 2:
Turn Hot Water Tap On.
Allow fan to run.
Measure the DC voltage as above again.
Expect approximately 2.5 Vdc or greater.
Notes:
1. Each pin on the PCB connector is numbered.
2. Appliance may lockout during test, reset as necessary until result is confirmed.
 pcb in situ.gif)
 connector x25 on pcb.gif)
