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Malfunctions - Trouble shooting LME 21
The red fault signal lamp lights red after fault shutdown. Reading out the fault cause diagnosis is made up of the following sequence:
Fault lit phase (wait time 10 s) > press unlock button for 3 s > flashing code > pause approx. 3 s > flashing code
Blink code
Possible cause
2 x blinks
No establishment of flame at the end of TSA
faulty or soiled ionization electrode
faulty or soiled fuel valves
Poor adjustment of burner
Faulty ignition device
3 x blinks
Air pressure switch does not close
LP faulty
LP incorrectly adjusted
Fan motor does not run
4 x blinks
Air pressure switch does not open
LP faulty
LP incorrectly adjusted
5 x blinks
Time monitoring air pressure switch
LP faulty
7 x blinks
Loss flame during operation
Poor adjustment of burner
faulty or soiled fuel valves
Short-circuit between ionization probe and ground
10 x blinks
Internal error
Wiring error
Faulty output contact
Other errors
The control outputs are de-energised during the fault cause diagnosis. The burner stays switched off. Exception, fault signal AL on
terminal 10. Switching on the burner again is not done until after unlocking. Press unlock button for 0.5 ... 3 s.
Fault
Motor does not start
Motor runs only 2 x 30 s
Motor runs, lockout in the preventilation
phase
Motor runs, lockout during TSA
No ignition
To dejam is not possible
Link controller does not move
Possible cause
No power detectable
Capacitor defective
Gas burner control defective
Gas pressure switch incorrectly adjusted
Motor defective
Ball shut-off closed
Air pressure switch defective
Air pressure switch incorrectly adjusted
Hose for air pressure switch defective
Ionizations electrode or
Isolation field defective
Ionisation current too low
Ionization electrode incorrectly adjusted
Ignition unit defective
Ignition electrode or Ionization field defective
Ignition cable defective
Ignition electrode incorrectly adjusted
Gas solenoid valve defective
Gas burner control defective
Servomotor defective
Servomotor incorrectly adjusted
Link controller rod jams
Remedy
Remedy
Check the wiring, main switch and control
Replace
Replace
Correctly adjust
Replace
Open the ball shut-off
Replace
Correctly adjust
Replace
Replace
Set the burner correctly
Correctly adjust
Replace
Replace
Replace
Correctly adjust
Checks, replace
Replace
Replace
Correctly adjust
Checks, correctly adjust
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