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15
Fault Finding Codes
Fault Code
Cause
Frequency
Limit Thermostat
(Twice per second)
operation
No flame detection
(Once per second)
signal
(Once every 2
False flame detection
seconds)
signal.
(Once every 4
Air flow not detected
Seconds)
Check
Check the operation of the boiler flow
temperature sensor.
Check the operation of the boiler
circulating pump.
Check flame detection circuit.
Check ignition system.
Check gas supply and gas valves
Inspect flame detection circuit.
Check control panel assembly.
Check that the fan operates.
Inspect the pressure pipes from flue
outlet to Air Pressure Switch.
Check the operation of the switch
Check that the flue or air inlet ducts
are not obstructed.
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