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20075344
GB
Faults - Possible causes - Solutions
8
Faults - Possible causes - Solutions
WARNING
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.
DANGER
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 blinks
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 incorrectly adjusted
Adjust or replace
Pressure switch pressure test 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 (defective electrical motor)
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
