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:
Apply a CH demand, allow the fan to run and measure the DC voltage as above again.
Expect approximately 2.5 Vdc or greater.
Measure the DC voltage between Pin 12 (Green) on X25 and a suitable earth.
Expect approximately 1.4 Vdc
Test 2:
Apply a CH demand, allow the fan to run and measure the DC voltage as above again.
Expect approximately 2.5 Vdc or greater.
 connector x25 on pcb.gif)
