Burner controls, ignition and flame safeguards
Siemens LMG Gas Burner Control (Bentone STG) fault codes
What all 8 Siemens LMG Gas Burner Control (Bentone STG) fault codes mean, in plain words, with a risk grade for each. These come from the manufacturer's own manual. The fix for each one is in WERCS Diagnose.
Get the fixes · plans from $49/moUpdated July 23, 2026
| Code | What it means | Risk |
|---|---|---|
| 2 blinks | Red LED: 2 blinks The burner locks out because no flame was established by the end of the safety time. | RED |
| 3 blinks | Red LED: 3 blinks The air pressure monitor does not close, which prevents the burner from operating. | RED |
| 4 blinks | Red LED: 4 blinks The air pressure monitor does not open or extraneous light is present, which locks out the burner. | RED |
| 5 blinks | Red LED: 5 blinks Extraneous light was detected during the pre purging cycle, which causes the gas burner control to fault and stop operating. | RED |
| 7 blinks | Red LED: 7 blinks The burner locks out because the flame was lost while the system was operating. | RED |
| 18 blinks | Red LED: 18 blinks The air pressure monitor opened during prepurging or operation, which locks out the burner. | RED |
| 19 blinks | Red LED: 19 blinks A faulty output contact was detected, which causes the gas burner control to fault and stop operating. | RED |
| 20 blinks | Red LED: 20 blinks The burner locks out because the control unit experienced an internal device fault. | RED |
Every code comes from the manufacturer's own manual. Subscribers see which manual and page.