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Codes fault
High temperature (priority 8)
Description:
Boiler temperature too high
Possible solutions:
Ascertain the good operation of the pump and, eventually, clean the heat exchanger
Low pressure (priority 9)
Description: Insufficient water pressure and, consequently, intervention of the minimum water
pressure switch
Possible solutions:
Restore the water pressure through the filling valve and check for possible water leaks.
Freezing (priority 10)
Description:
The freezing of the heat exchanger has been detected. When the flow temperature sensor
detects a temperature below 2°C the burner ignition is inhibited till the sensor detects a
temperature higher than 5°C.
Possible solutions:
Cut the electrical supply to the boiler, close the gas cock, defreeze, carefully, the heat exchanger.
Safety thermostat (priority 11)
Description: Intervention of the safety thermostat.
Possible solutions:
Press the reset push button on the panel board and ascertain that the thermostat and/or its
harness is not interrupted..
D.H.W. temperature sensor (priority 12)
Description:
Intervention of the D.H.W. temperature sensor (if applicable)
Possible solutions:
Check the sensor for good operation (see table Resistance/Temperature) and/or its harness.
C.H. flow temperature sensor (priority 13)
Description: Intervention of the C.H. flow temperature sensor
Possible solutions:
Check the sensor for good operation (see table Resistance/Temperature) and/or its harness.
Factory parameters (FA) (priority 14)
Description: Corruption of Factory parameters (FA)
Possible solutions: Press the reset button on panel board: if the inconvenient is not solved
replace the PCB
Lockout (priority 15)
Description: Lack of gas or burner ignition
Possible solutions:Check the gas supply and/or the ignition electrode/ionization.
Parasitic flame (priority 16)
Description: Flame detected during ignition phase
Possible solutions:Inspect the harness of the combined ignition/ionization electrode and
remove possible oxidation from electrode; if the problem is not solved replace the electrode.
Parasitic flame (priority 17)
Description: Flame detected after the extinction of the burner
Possible solutions: Inspect the harness and check for possible internal leak of the gas valve.
Flame control (priority 18)
Description: Damaged flame control
Possible solutions: Replace PCB
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