Burner controls, ignition and flame safeguards
Siemens LMO14/24 Oil Burner Control fault codes
What all 5 Siemens LMO14/24 Oil Burner Control 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 flashes | Red LED: 2 flashes The burner locks out because no flame signal was established by the time the safety period expired. | RED |
| 4 flashes | Red LED: 4 flashes The burner locks out because false light was detected while the system was starting up. | RED |
| 7 flashes | Red LED: 7 flashes The burner locks out because the flame was lost three times during normal operation. | RED |
| 8 flashes | Red LED: 8 flashes The burner locks out because the oil preheater failed to reach its cutoff temperature within ten minutes. | RED |
| 10 flashes | Red LED: 10 flashes The burner locks out because of incorrect wiring, an internal fault, or two faults occurring simultaneously. | RED |
Every code comes from the manufacturer's own manual. Subscribers see which manual and page.