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Signal
Problem
2 blinks
Once the pre-purging
phase and safety time
have passed, the burner
goes into lockout with-
out the appearance of
the flame
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
6 blinks
The burner switches on,
but then stops in lockout
7 blinks
The burner goes into
lockout immediately fol-
lowing the appearance
of the flame
The burner goes into
lockout during the pas-
sage between the 1st
and 2nd stage, or be-
tween the 2nd and the
1st stage
Burner goes into lockout
during operation
10 blinks
The burner does not
switch on, and the lock-
out appears
The burner goes into
lockout
Faults - Possible causes - Solutions
Possible cause
The operation solenoid lets little gas through
One of the two solenoid valves does not open
Gas pressure too low
Ignition electrode incorrectly adjusted
Electrode grounded due to broken insulation
High voltage cable defective
High voltage cable deformed by high tempera-
ture
Faulty ignition transformer
Incorrect valve or transformer electrical wiring
Defective control box
A closed valve upline the gas train
Air in pipework
Gas valves unconnected or with interrupted coil Check connections or replace coil
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
Defective or incorrectly adjusted servomotor
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
Too much air or too little gas
Probe or ionisation cable grounded
Incorrect electrical wiring
Defective control box
Presence of electromagnetic disturbances in the
thermostat lines
Presence of electromagnetic disturbance
29
GB
Recommended remedy
Increase
Replace them
Increase pressure at governor
Adjust it
Replace
Replace
Replace and protect
Replace
Check
Replace
Open
Bleed air
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
Adjust or replace
Increase
Adjust
Check probe position
Withdraw or replace cable
Check grounding
Invert them
Replace control box
Adjust air and gas
Replace worn parts
Check
Replace
Filter or eliminate
Use the radio disturbance protection
kit
20063795
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