TROUBLESHOOTING
35
FAULT
CAUSE
CORRECTIVE ACTION
Control thermostat problem
The boiler keeps shutting
down, and the control
panel warning light
comes on
Check functioning of thermostat
Check the temperature setting
Check the electrical wiring
Check the sensors
No water supply
Air in the circuit
Check the circuit pressure
Check the vent valve
Boiler dirty
Clean the flue gas pipes
Boiler and burner
mismatched
Check specifications
and settings
Insufficient air/fuel flow
to burner
Check and adjust the
burner
Control thermostat problem
Check the functioning of
the thermostat
Check the temperature setting
The boiler does not reach
its temperature setpoint
The boiler becomes dirty
very quickly
Burner badly adjusted
Blockage in stack
Burner air intake dirty
Check the adj. of the burner
(perform flue gas analysis)
Clean the flue gas pipes
and stack
Clean the burner air intake
Air in the circuit
The boiler has reached the
set temperature but the
radiators are still cold
Bleed the circuit
Pump malfunctioning
Check/unseize the pump
Problem with minimum temp.
thermostat (if present)
Check the temperature
setting
Fumes escaping into the air
There is a smell of fumes
Clean the boiler body
Clean the flue gas pipes
Check that the boiler, flue gas pipes
and stack are all properly sealed
Check the door seal
Circuit pressure too high
The safety valve
keeps opening
Check the circuit pressure
Check pressure reducer functioning
Check pressure reducer setting
Problem with heating
system expansion vessel
Check the efficiency of the
expansion vessel
TECHNICAL ASSISTANCE SERVICE