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Faults - Possible causes - Solutions
8 Faults - Possible causes - Solutions
In the event the burner stops, in order to prevent
any damage to the installation, do not unblock the
burner more than twice in a row. If the burner
locks out for a third time, contact the customer
service.
In the event there are further lockouts or faults
with the burner, the maintenance interventions
must only be carried out by qualified, authorised
personnel, in accordance with the contents of this
manual and in compliance with the standards and
regulations of current laws.
Signal Problem Possible cause Recommended remedy
2 blinks Once the pre-purging
phase and safety time
have passed, the burn-
er goes into lockout
without the appearance
of the flame.
The operation solenoid lets little gas through. Increase
One of the two solenoid valves does not open Replace
Gas pressure too low Increase pressure at governor
Ignition electrode incorrectly adjusted Adjust it
Electrode grounded due to broken insulation Replace
High voltage cable defective Replace
High voltage cable deformed by high temperature Replace and protect
Ignition transformer defective Replace
Incorrect valve or transformer electrical wiring Check
Defective control box Replace
A closed valve upline the gas train Open
Air in pipework Bleed air
Gas valves unconnected or with interrupted coil Check connections or replace coil
3 flashes The burner does not
switch on, and the lock-
out appears
Air pressure switch in operating position Adjust or replace
The burner switches on,
but then stops in lockout
Air pressure switch does not switch owing to lack of air pressure:
Air pressure switch poorly adjusted Adjust or replace
Pressure switch pressure point pipe blocked Clean
Poorly adjusted head Adjust
High pressure in the furnace Connect air pressure switch to fan
suction line
Lockout during pre-
purging phase
Defective motor control contactor
(only three-phase version)
Replace
Defective electrical motor Replace
Motor lockout (only three-phase version) Replace
4 blinks The burner switches on,
but then stops in lockout
Flame simulation Replace the control box
Lockout when burner
stops
Permanent flame in the combustion head or flame
simulation
Eliminate persistence of flame or
replace control box
6 blinks The burner switches on,
but then stops in lockout
Defective or incorrectly adjusted servomotor Adjust or replace
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 A) Check probe position
Earth probe Withdraw or replace cable
Burner poorly earthed Check earthing
Phase and neutral connections inverted Invert them
Defective flame detection circuit Replace the control box
Burner locks out when
shifting from minimum
to maximum output and
vice versa
Too much air or too little gas Adjust air and gas
Burner goes into lock-
out during operation
Probe or ionisation cable grounded Replace worn parts
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