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3 . 1 5 Troubleshooting
FAULT
There is a smell of gas .
There is a smell of combustion
fumes.
Combustion is uneven.
Ignition is slow and the burner
pulses.
Boiler gets dirty very quickly.
Burner does not start on signal
from control panel.
Boiler does not start up.
The boiler does not reach its tem-
perature set point.
Burner locks out.
Boiler reaches set temperature but
radiators are still cold.
Pump does not start.
CAUSE
Leaks from the supply circuit.
There is a smell of combustion
fumes.
Incorrect gas pressure at burner.
Burner and heat exchanger need
cleaning.
Heat exchanger pipes obstructed.
Fan malfunctioning.
Incorrect gas pressure at burner.
Problem with the ignition electrode. − Check position and condition.
Inefficient combustion.
Problem with gas valve.
No electrical power
(green LED off).
Burner dirty.
Insufficient air/fuel flow to burner.
Boiler settings.
Boiler settings.
No water supply.
Air in the circuit.
Pump malfunctioning.
Pump malfunctioning.
53
TECHNICAL ASSISTANCE SERVICE
SOLUTION
− Check that all joints are tight and that
the pressure measurement points are
closed.
Check:
− That all joints are tight.
− That the flues are not obstructed.
− That combustion is efficient.
− Check setting.
− Check condition.
− Check cleanliness of pipes.
− Check functioning.
− Check setting.
− Check colour of flame.
− Check combustion settings.
− Check presence of 230Vac at termi-
nals of gas valve. Check wiring and
connections.
Check:
− electrical connections.
− fuse.
− Clean the combustion chamber.
− Check and adjust the burner.
− Check correct functioning.
− Check temperature setting.
− Check correct functioning.
− Check temperature setting.
− Check electrical wiring.
− Check positioning of sensors.
− Check the vent and bleed valves.
− Check CH circuit pressure.
− Bleed the circuit.
− Unseize the pump.
− Change the pump.
− Check pump electrical connections.
− Unseize the pump.
− Change the pump.
− Check pump electrical connections.
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