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20033283
Faults - Possible causes - Solutions
GAS OPERATION
SYMBOL
(1)
FAULT PROBABLE CAUSE SUGGESTED REMEDY
The burner does not start
No electrical power supply
Close all switches and check con-
nections
A limiter or safety control device is open Adjust or replace
Control box lock-out Reset control box
Control box fuse blown
Replace
(2)
Erroneous electrical connections Check
Defective control box Replace
No gas supply
Open the manual valves between
meter and train
Mains gas pressure insufficient Contact your GAS COMPANY
Minimum gas pressure switch fails to close Adjust or replace
Air pressure switch in operating position Adjust or replace
Contact (locking cam) of servomotor does
not operate
Adjust locking cam
or replace servomotor
The burner does not start and
a function lock-out occurs
Flame simulation Replace control box
Defective motor command control device Replace
Defective electrical motor Replace
Motor protection tripped Reset thermal cut-out
The burner starts but stops at
maximum air damper setting
Contact of servomotor does not operate
(Cam-max. opening)
Adjust cam (max.)
or replace servomotor
The burner starts and then
goes into lock-out
Air pressure switch inoperative due to insufficient air pressure:
Air pressure switch adjusted badly Adjust or replace
Pressure switch pressure point pipe blocked Clean
Poorly adjusted head Adjust
Dirty fan Clean
High negative draft in chamber Ask our technical office
The burner starts and then
goes into lock-out
Fault in flame detection circuit Replace control box
The burner remains in pre-
purging phase
Contact servomotor does not operate
(Minimum cam)
Adjust cam (minimum)
or replace servomotor
After pre-purge and the safety
time, the burner goes to lock-
out and the flame does not
appear
The solenoid VP1 allows little gas through Increase
Solenoid valves VP1 or VP2 fail to open Renew the coil or rectifier panel
Gas pressure too low Increase pressure at governor
Ignition electrode wrongly adjusted Adjust
Grounded electrode due to broken insulation Replace
High voltage cable defective or grounded Replace
High voltage cable deformed by high tempera-
ture
Replace and protect
Ignition transformer defective Replace
Erroneous valves or transformer electrical con-
nections
Repeat connection
Defective control box Replace
A cock down-line of the gas train is closed Open
Air in pipework Bleed air
The burner goes to lock-out
right after flame appearance
The solenoid VP1 or VP2 allows little gas through Increase
Dirty flame sensor Check, replace flame sensor
Defective connection Check, replace flame sensor
Insufficient defection current (min.70 µA)
Measure current, replace flame
sensor
Exhausted, defective flame sensor Replace
Max. gas pressure switch operates Adjust or replace
Defective control box Replace
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