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Signal
Problem
3 blinks
The burner does not
switch on, and the lock-
out appears
The burner starts and
then goes into lockout
Lockout during pre-
purging phase
4 blinks
The burner starts and
then goes into lockout
Lockout when the burn-
er stops
7 blinks
The burner goes into
lockout immediately fol-
lowing the appearance
of the flame
Burner goes into lockout
during operation
10 blinks
The burner does not
switch on, and the lock-
out appears
The burner goes into
lockout
No blink
The burner does not
start
The burner continues to
repeat the start-up cy-
cle, without lockout
20063667
Faults - Possible causes - Solutions
Possible cause
Air pressure switch in operating position
Air pressure switch inoperative due to insufficient air pressure:
Air pressure switch poorly adjusted
Pressure switch pressure point pipe blocked
Combustion head poorly regulated
High pressure in the furnace
Defective motor control contactor
Defective electrical motor
Motor lockout
Flame simulation
Permanent flame in the combustion head or
flame simulation
The operation solenoid lets little gas through
Ionisation probe incorrectly adjusted
Insufficient ionisation (less than 5 µA)
Earth probe
Burner poorly grounded
Phase and neutral connections inverted
Defective flame detection circuit
Probe or ionisation cable grounded
Incorrect electrical wiring
Defective control box
Presence of electromagnetic disturbances in the
thermostat lines
Presence of electromagnetic disturbance
No electricity supply
A limiter or safety control device is open
Line fuse blocked
Defective control box
No gas supply
Mains gas pressure insufficient
Minimum gas pressure switch fails to close
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.
26
GB
Recommended remedy
Adjust or replace
Adjust or replace
Clean
Adjust
Connect air pressure switch to fan
suction line
Replace
Replace
Replace
Replace the control box
Eliminate persistence of flame or re-
place control box
Increase
Adjust
Check probe position
Withdraw or replace cable
Check grounding
Invert them
Replace control box
Replace worn parts
Check
Replace
Filter or eliminate
Use the radio disturbance protection
kit
Close all switches and check connec-
tions
Adjust or replace
Replace
Replace
Open the manual valves between
contactor and train
Contact your gas company
Adjust or replace
Reduce the intervention pressure of
the minimum gas pressure switch.
Replace the gas filter cartridge.
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