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3.11 Troubleshooting
FAULT
There is a smell of fumes
The boiler gets dirty very quickly
The generator is at temperature but the
heating system is cold
The boiler does not reach its
temperature setpoint
The generator triggers a thermal safety
block
The safety valve keeps opening
The circulator does not work
CAUSE
Fumes escaping into the air
Burner badly adjusted
Blockage in stack
Burner air intake dirty
Air in the circuit
Pump malfunctioning
Dirt boiler body
Burner capacity insufficient
Boiler temperature setpoint
Safety thermostat / delivery
overtemperature
No water
Incorrect central heating circuit pressure
CH expansion vessel
Pump seized
Electrical connections
The request from the ambient thermostat
is missing
59
COMMISSIONING AND MAINTENANCE
SOLUTION
− Check that the burner body is clean
− Check that the flue pipes are clean
− Check the condition of the boiler seals
− Check the quality of combustion
− Check adjustment of burner (perform
flue gas analysis)
− Clean flue pipes
− Clean the burner air intake
− Bleed the circuit
− Check/unseize the pump
− Change the pump
− Clean
− Check and adjust the burner
− Check correct functioning
− Check the temperature setting
− Check correct functioning
− Check the temperature setting
− Check the electrical wiring
− Check the position of the sensor bulbs
− Check the bleed valve
− Check the heating circuit pressure
− Check the circuit pressure
− Check pressure reducer functioning
− Check efficiency of safety valve
− Check the efficiency of the expansion
vessel
− Check the pump and connections
− Check the temperature controller, sen-
sors and connections
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