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Problem
The burner does not start
The burner does not
switch on, and the lock-
out appears
The burner starts up but
stops at the damper max-
imum opening
The burner switches on,
P
but then stops in lockout
The burner turns on and
then remains in lockout
mode
The burner remains in
pre-purging phase
Once
the
and the safety time has
elapsed the burner goes
into lockout without the
flame appearing
1
Lockout with flame ap-
pearing
20079034
Faults - Possible causes - Solutions
Possible cause
No electrical power supply
A limit or safety thermostat/pressure switch
open
Control box lockout
Control box fuse interrupted
Incorrect electrical wiring
Defective control box
No gas supply
Mains gas pressure insufficient
Minimum gas pressure switch fails to close
Air pressure switch in operating position
The servomotor contact does not intervene
(closure cam 0°)
Flame simulation
Faulty motor remote control switch
Defective electrical motor
Motor lockout
The servomotor contact does not intervene
(maximum cam opening)
Air pressure switch does not switch owing to lack of air pressure:
Air pressure switch poorly adjusted
Pressure switch pressure point pipe blocked
Poorly adjusted head
Dirty fan
High depression in the furnace
Failure to the flame detection circuit
The servomotor contact does not intervene
(minimum cam)
Gas pressure too low
Ignition electrode incorrectly adjusted
Electrode grounded due to broken insulation
Faulty or grounded high voltage cable
pre-purging
High voltage cable deformed by high tempera-
ture
Faulty ignition transformer
Incorrect valve or ignition transformer connec-
tions
Defective control box
A closed valve upline the gas train
Air in pipework
The VS or VR solenoids let too little gas through Increase
Dirty flame sensor
Faulty connection
Insufficient detection current (min. 6 µA)
Flame sensor exhausted, faulty
Maximum gas pressure switch intervention
Defective control box
38
GB
Recommended remedy
Close all switches and check connections
Adjust or replace
Release the control box
Replace it as indicated in Fig. 41
Check
Replace
Open the manual valves between meter
and train
Contact your gas company
Adjust or replace
Adjust or replace
Adjust the closure cam 0° or replace the
servomotor
Replace the control box
Replace
Replace
Release the thermal relay
Cam adjustment (maximum opening) or re-
place the servomotor
Adjust or replace
Clean
Adjust
Clean
Contact our Technical Department
Replace the control box
Cam adjustment (minimum) or replace the
servomotor
Increase pressure at governor
Adjust it
Replace
Replace
Replace and protect
Replace
Redo them
Replace
Open
Bleed air
Check, replace flame sensor
Check, replace flame sensor
Measure current, replace flame sensor
Replace
Adjust or replace
Replace
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