Set Appliance State:
Gas Off
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to DC Volts 
CH Demand
Unclip and flip display PCB over then secure it in place with a screw as shown
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Measurement:
Test 1:
Measure the voltage at terminal 9 to a suitable earth point.
Voltage should be approximately 1.5V DC.
If voltage is not present at pin 9 then select
that option below, otherwise continue to test 2.
Test 2:
Measure the voltage at terminal 5 to a suitable earth point.
Voltage should be approximately 1.5V DC.
Note:
This test requires gas off as when burner is lit the voltages change.
Measure the voltage at terminal 9 to a suitable earth point.
Voltage should be approximately 1.5V DC.
If voltage is not present at pin 9 then select
that option below, otherwise continue to test 2.
Test 2:
Measure the voltage at terminal 5 to a suitable earth point.
Voltage should be approximately 1.5V DC.
Note:
This test requires gas off as when burner is lit the voltages change.
