Fireye NX6100 F10 flame failure during pilot ignition, what to check?
I'm getting an F10 flame failure on our Fireye NX6100 controller every time the burner tries to light off. I don't see a spark or a pilot flame through the sight glass. What should I check first?
An F10 flame failure on the Fireye NX6100 means the controller didn't detect a flame when expected. Since this occurs during pilot ignition and no spark or pilot flame is visible, the most likely cause is a problem with the pilot ignition itself. This could be due to a lack of spark, insufficient pilot gas pressure, or issues with the flame detection system.
Likely causes and checks
1No pilot flame at ignition
- Points to it
- The flame detector did not register a flame during the pilot ignition sequence (status 11-12). This is indicated by repeated F10 faults at pilot status and the absence of a visible spark or pilot flame.
- Check
- Observe a start with a qualified technician to confirm the presence of spark, pilot flame, and the flame signal on the overview screen.
2Pilot gas pressure or regulator issues
- Points to it
- Even if a spark is present, a weak or absent pilot flame can lead to an F10 fault. This suggests a problem with the pilot gas supply or its regulation.
- Check
- Read the pilot gas pressure during the trial for ignition and confirm that the pilot valve opens correctly.
3Flame present but not seen by the scanner
- Points to it
- If a flame is visibly present but the controller reports an F10, the issue might be with the flame scanner's ability to detect it. This could be due to wiring, lens, or sighting problems, or a low flame signal.
- Check
- Check the scanner wiring, lens, and sighting. Compare the current flame signal with historical readings from earlier successful starts.
Next check: The first step is to observe a start with a qualified technician to visually confirm if there is a spark and a pilot flame, and to monitor the flame signal on the controller's overview screen. This will help determine if the problem is with ignition, fuel supply, or flame detection.
Related questions
Describe the fault or upload a photo, and InduQT checks it against the manufacturer manuals. Share the result here when it helps someone else.