46
TROUBLESHOOTING
The following are the most common causes of
faults and their solutions.
FAULT:
The burner does not switch on.
FAULT:
The burner switches on regularly but shuts down im-
mediately.
FAULT:
Difficulty in adjusting the burner and/or lack of effi-
ciency.
FAULT:
The burner is easily soiled with soot.
FAULT:
Smell of gas and/or unburnt products.
FAULT:
The boiler does not reach operating temperature.
FAULT:
The boiler is at operating temperature but the heat-
ing system is cool.
FAULT:
The safety thermostat triggers.
FAULT:
The boiler safety valve triggers.
FAULT:
Overheating of members due to lack of water in boil-
er.
FAULT:
Water on floor near flue gas casing (condensation).
SOLUTIONS:
- check the electrical connections;
- check the regular flow of fuel;
- check that the fuel feeding system is intact and clean, and that it is deaerated;
- check that ignition sparks are performed regularly and operation of the burner ap-
pliance;
- check triggering of the boiler safety thermostat with manual rearming;
- check calibration of the adjustment thermostat.
SOLUTIONS:
- check flame detection, air calibration and operation of the burner appliance.
SOLUTIONS:
- check that the burner, boiler, boiler/chimney duct and chimney are clean;
- check sealing of the flue gas circuit (inspection doors, burner plate, flue gas casing,
boiler/chimney fitting);
- check the regular flow of fuel and the real output supplied by the burner;
- check for any scales and perform a chemical wash.
SOLUTIONS:
- check burner adjustment (flue gas analysis);
- check the amount of fuel;
- check clogging of the chimney and cleanliness of the burner air path (dust).
SOLUTIONS:
- check sealing of the fuel supply system (if gas);
- check sealing of the flue gas circuit (inspection doors, burner plate, flue gas casing,
boiler/chimney fitting);
- check that the rubber holder on the flame warning light is connected to the air sock-
et of the burner or if it is plugged.
SOLUTIONS:
- check that the flue gas side and water side of the boiler are clean;
- check coupling, adjustment and efficiency of the burner;
- check the temperature set on the thermostats and their correct operation;
- check positioning of the thermostat probes;
- make sure that the boiler has sufficient output for the system.
SOLUTIONS:
- check that the system is deaerated;
- check that the circulation pumps work properly.
SOLUTIONS:
- check that electric wiring is correct;
- check positioning of the thermostat probes;
- check the calibration of the thermostats and their correct operation.
SOLUTIONS:
- check the pre-load pressure of the system;
- check that the expansion vessel is sized correctly;
- check that the safety pressure valves are calibrated correctly.
SOLUTIONS:
- switch off the burner, do not introduce water or open the inspection doors and wait
for return to room temperature before performing any operation.
SOLUTIONS:
- check the correct positioning of the probes, correct operation and calibration of the
boiler adjustment thermostat (minimum 60°C);
- check that the exhaust in the flue gas casing is connected to a collection recipient;
- check that the anti-condensation pump (if present) works correctly and is properly
adjusted;
- check that the water temperature returning from the system is no less than 50 °C.
