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Operating concept
Diagnosis of cause of
fault
R ed LE D on
F S
A L
Landis & Staefa Division
• Burner control has initiated lockout
⇒ Red fault LED on
• Burner control in operation
⇒ Green flame signal LED on
F S
After lockout, the red fault LED is steady on.
For reading the cause of fault, refer to the blink code given in the following table:
L E D o n (w a itin g tim e > 1 0 s)
F a u lt
Error code table
Blink code
Possible cause
•
2 x
No establishment of flame at the end of «TSA»
••
–
–
–
•
3 x
Air pressure monitor does not close
•••
–
–
–
•
4 x
Air pressure monitor does not open or extraneous light on burner startup
••••
–
–
•
5 x
Extraneous light during pre-purging
•••••
–
•
7 x
Loss of flame during operation
•••••••
–
–
–
•
8...17 x
Free
••••••••
...................
••••••••••
•••••••
•
18 x
Air pressure monitor opens during pre-purging or operation
••••••••••
–
••••••••
–
•
19 x
Faulty output contact
••••••••••
–
•••••••••
–
•
20 x
Internal device fault
••••••••••
••••••••••
During the time the cause of the fault is diagnosed, the control outputs are deactivated.
– The burner remains shut down
– Exception: fault status signal «AL» at terminal 10
The burner is switched on only after a reset is made.
– Press lockout reset button for 0.5...3 seconds
CC1N7421E
December 04, 1998
• Reset
Press lockout reset button for 0.5...3 s
• Diagnosis of cause of fault
– Wait > 10 s
– Press lockout reset button for > 3 s
– Read blink code of red fault LED
A L
• Restart
Press lockout reset button for 0.5...3 s
• Read flame establishment time
– Press lockout reset button for > 3 s
– Read blink code of green flame signal
P ress lo cko ut re se t
bu tton
for > 3 s
B lin k co d e
Faulty or soiled detector electrode
Faulty or soiled fuel valves
Poor adjustment of burner
«LP» faulty
«LP» incorrectly adjusted
Fan motor does not run
«LP» faulty
«LP» incorrectly adjusted
Or internal device fault
Poor adjustment of burner
Faulty or soiled fuel valves
Short-circuit between detector electrode and ground
«LP» incorrectly adjusted
Four times loss of flame during operation (LMG25)
Wiring error
External power supply on output terminal
⇒ «Error code table»
LED
⇒ «Error code table»
O ff
B lin k co d e
A pp ro x.
3 s
13/16
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