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26.- FAILURES
This section provides a list of the most common burner and boiler failures.
Burner error code
We have already mentioned that the burner is equipped with a cut-out system, indicated by
the reset button light. It may cut out accidentally, and in this case the steady red light on this
button will come on. You may unblock it by pressing the button for approx. 1 second. When the
burner is blocked and the steady red light is on, visual failure diagnosis may be activated, in
accordance with the error code table. To enter visual failure diagnosis mode, hold down the
reset button for at least three seconds.
Error code table
Red flashing LED
code
“AL” on
term. 10
Possible cause
Flashes 2 times On No flame established when ignition safety
time ends.
- Fuel valves defective or dirty
- Flame detector defective or dirty
- Burner maladjustment, no fuel
- Ignition unit defective
Flashes 4 times On External light during burner ignition
Flashes 7 times On Excessive flame loss during functioning
(limited number of repetitions)
- Fuel valves defective or dirty
- Flame detector defective or dirty
- Burner maladjustment
Flashes 8 times On Supervision of fuel pre-heater time
Flashes 10 times On Cabling fault or internal failure, output
contacts, other failures
During the failure diagnosis time, the control outputs are disabled and the burner remains off.
To exit failure diagnosis and activate the burner again, reset the burner control. Hold down
the reset button for approx. 1 second (<3 s).
Boiler failures:
FAILURE CAUSE SOLUTION
- The pump is not turning Unblock the pump
RADIATOR
DOES NOT
HEAT UP
- Air in hydraulic circuit Drain the installation and
the boiler (the automatic
air drain valve cap must
always be loose)
- Burner badly adjusted Adjust it correctly
- Flue not correctly sealed Eliminate any leaks
- Flame unstable Examine the burner
EXCESSIVE
NOISE
- Flue not insulated Suitably insulate it
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