49
COMMISSIONING AND MAINTENANCE
3.10
Troubleshooting
FAULT
CAUSE
SOLUTION
The boiler becomes dirty very quickly
Burner badly adjusted
− Check adjustment of burner (perform
flue gas analysis)
Blockage in stack
− Clean flue pipes
Burner air intake dirty
− Clean the burner air intake
The boiler does not reach its tempera-
ture setpoint
Boiler dirty
− Clean
Burner capacity insufficient
− Check and adjust the burner
Problem with boiler control thermostat
− Check correct functioning
− Check the temperature setting
The generator triggers a thermal safety
block
Problem with boiler control thermostat
− Check correct functioning
− Check the temperature setting
− Check the electrical wiring
− Check the position of the sensor bulbs
No water
− Check the bleed valve
− Check CH circuit pressure
The generator is at temperature but the
heating system is cold
Air in the circuit
− Bleed the circuit
Pump malfunctioning
− Check/unseize the pump
− Change the pump
Minimum temperature thermostat faulty
− Replace the minimum temperature
thermostat
There is a smell of fumes
Fumes escaping into the air
− 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
The safety valve keeps opening
Incorrect circuit pressure
− Check the circuit pressure
− Check pressure reducer functioning
− Check pressure reducer setting
CH expansion vessel
− Check the efficiency of the expansion
vessel
