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Faults - Possible causes - Solutions
3 blinks The burner does not
switch on, and the lock-
out appears
Air pressure switch in operating position Adjust or replace
The burner starts and
then goes into lockout
Air pressure switch inoperative due to insufficient air pressure:
Air pressure switch poorly adjusted Adjust or replace
Pressure switch pressure point pipe blocked Clean
Combustion head poorly regulated Adjust
High pressure in the furnace Connect air pressure switch to fan
suction line
Lockout during pre-
purging phase
Defective motor control contactor Replace
Defective electrical motor Replace
Motor lockout Replace
4 blinks The burner starts and
then goes into lockout
Flame simulation Replace the control box
Lockout when the burn-
er stops
Permanent flame in the combustion head or
flame simulation
Eliminate persistence of flame or re-
place control box
7 blinks The burner goes into
lockout immediately fol-
lowing the appearance
of the flame
The operation solenoid lets little gas through Increase
Ionisation probe incorrectly adjusted Adjust
Insufficient ionisation (less than 5 µA) Check probe position
Earth probe Withdraw or replace cable
Burner poorly grounded Check grounding
Phase and neutral connections inverted Invert them
Defective flame detection circuit Replace control box
Burner goes into lockout
during operation
Probe or ionisation cable grounded Replace worn parts
10 blinks The burner does not
switch on, and the lock-
out appears
Incorrect electrical wiring Check
The burner goes into
lockout
Defective control box Replace
Presence of electromagnetic disturbances in the
thermostat lines
Filter or eliminate
Presence of electromagnetic disturbance Use the radio disturbance protection
kit
No blink The burner does not
start
No electricity supply Close all switches and check connec-
tions
A limiter or safety control device is open Adjust or replace
Line fuse blocked Replace
Defective control box Replace
No gas supply Open the manual valves between
contactor and train
Mains gas pressure insufficient Contact your gas company
Minimum gas pressure switch fails to close Adjust or replace
The burner continues to
repeat the start-up cy-
cle, without lockout
The gas pressure in the gas mains lies very close
to the value to which the gas pressure switch has
been set.
The sudden pressure drop after valve opening
causes the temporary opening of the pressure
switch itself; the valve immediately closes and
the
burner comes to a halt.
Pressure increases again, the pressure switch
closes
again and the ignition cycle is repeated.
The sequence repeats endlessly.
Reduce the intervention pressure of
the minimum gas pressure switch.
Replace the gas filter cartridge.
Signal Problem Possible cause Recommended remedy
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