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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
WARNING
service.
Signal
Problem
2 blinks
Once the pre-purging
phase and safety time
have passed, the burn-
er goes into lockout
without the appearance
of the flame
3 blinks
The burner does not
switch on, and the lock-
out appears
The burner switches on,
but then stops in lockout
Lockout during pre-
purging phase
4 blinks
The burner switches on,
but then stops in lockout
Lockout when burner
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
Burner locks out when
shifting from minimum
to maximum output and
vice versa
Burner goes into lock-
out during operation
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 temperature Replace and protect
Ignition transformer defective
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
Air pressure switch in operating position
Air pressure switch does not switch owing to lack of air pressure:
Air pressure switch incorrectly adjusted
Pressure switch pressure test point pipe blocked
Poorly adjusted head
High pressure in the furnace
Defective motor control contactor
(only three-phase version)
Defective electrical motor
Motor lockout (defective electrical motor)
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 A)
Earth probe
Burner poorly earthed
Phase and neutral connections inverted
Defective flame detection circuit
Too much air or too little gas
Probe or ionisation cable grounded
37
GB
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
DANGER
manual and in compliance with the standards and
regulations of current laws.
Recommended remedy
Increase
Replace
Increase pressure at governor
Adjust it
Replace
Replace
Replace
Check
Replace
Open
Bleed air
Check connections or replace coil
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
replace control box
Adjust or replace
Increase
Adjust
Check probe position
Withdraw or replace cable
Check earthing
Invert them
Replace the control box
Adjust air and gas
Replace worn parts
20075006
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