2.19 Troubleshooting
FAULT CAUSE SOLUTION
The boiler becomes dirty very quickly
Burner badly adjusted
− Check the adjustment of the burner
(perform ue gas analysis)
Blockage in stack − Clean the ue gas pipes and stack
Burner air intake dirty − Clean the burner air intake
The boiler does not reach its tempera-
ture setpoint
Boiler dirty − Clean the ue gas pipes
Boiler and burner mismatched − Check specications and settings
Insufcient air/fuel ow to burner − Check and adjust the burner
Incorrect adjustment
− Check correct functioning
− Check the temperature setting
The boiler keeps shutting down, and the
control panel warning light comes on
Incorrect adjustment
− Check correct functioning
− Check the temperature setting
− Check the electrical wiring
− Check the sensors
No water supply − Check the circuit pressure
Air in the circuit
− Check the circuit pressure
− Check the vent valve
The boiler has reached the set tempera-
ture but the radiators are still cold
Air in the circuit − Bleed the circuit
Pump malfunctioning − Check/unseize the pump
Problem with minimum temperature
thermostat (if present)
− Check the temperature setting
Problem with minimum temp. thermo-
stat (if present)
− Check the efciency of the expansion
vessel
There is a smell of fumes Fumes escaping into the air
− Clean the boiler body
− Clean the ue gas pipes
− Check that the boiler, ue gas pipes
and stack are all properly sealed
− Check the door seal
There is a smell of gas Gas supply circuit.
− Check the seals, possible blockages and
fuel quality.
The safety valve keeps opening
Circuit pressure too high
− Check the circuit pressure
− Check pressure reducer functioning
− Check pressure reducer setting
Problem with heating system expansion
vessel
− Check the efciency of the expansion
vessel
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