Set Appliance State:
Gas Off
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to DC Volts 
Turn Hot Water Tap On
Adjust potentiometer P4 to its minimum (fully clockwise)
Connect a link between pin 1 and 2 on terminal X4a
Selector Switch in Hot Water Position
Connect a link between pin 1 and 2 on terminal X4a
Selector Switch in Hot Water Position
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Measurement:
Test 1:
During the sparking stage of the ignition sequence measure the DC voltage between the red wire marked 2 and the violet wire marked 1 on X6 connector at the PCB.
Voltage should be approximately 24V DC.
Test 2:
Once appliance has gone to ignition lockout, turn potentiometer P4 to maximum (fully anti-clockwise), reset the appliance and repeat the test.
Voltage should now be approximately 36V DC.
During the sparking stage of the ignition sequence measure the DC voltage between the red wire marked 2 and the violet wire marked 1 on X6 connector at the PCB.
Voltage should be approximately 24V DC.
Test 2:
Once appliance has gone to ignition lockout, turn potentiometer P4 to maximum (fully anti-clockwise), reset the appliance and repeat the test.
Voltage should now be approximately 36V DC.
Isolate as per TOPs P4
and refit as necessary