Fireye NX6300 (Nexus) fault F64: Profile Invalid
F64 means the controller will not fire the selected fuel/air profile because its data no longer matches the burner configuration. This is a deliberate safety block: a drive was deselected, a servo was replaced, or the profile was uploaded from a PC and not yet verified on this burner.
Diagnose this with AI
Try Free Boiler Diagnostic Upload a keypad photo, the fault history or a parameter export from your Fireye NX6300 (Nexus). InduQT compares the evidence and suggests the next useful checks.
When it happens
- Before start-up, when the profile is selected
Reading the subset
| Subset | What it tells you |
|---|---|
| Drive number | A drive used in the profile has since been deselected |
| Profile + 100 | The profile uses a servo that was replaced, or was uploaded and not verified |
Where it sits in the burner
Supervised functions: Firing-rate positioning, Controller self-checks.
| Component | Signals to look at | How it fails |
|---|---|---|
| Burner management controller | Burner sequence state, Controller supply voltage | Configuration or commissioning data changed; Controller internal fault; Supply voltage, frequency or grounding problem; Electrical noise on signal wiring |
| Fuel valve actuator and linkage | Fuel valve position, Firing rate | Damper or valve linkage slip; Actuator or feedback fault; Air/fuel ratio drift |
| Air damper, actuator and linkage | Air damper position, Firing rate | Damper or valve linkage slip; Actuator or feedback fault; Air/fuel ratio drift |
Likely causes and checks
1Servo replaced
- Points to it
- After a servo swap; subset is the profile number plus 100.
- Check
- A qualified commissioning engineer checks the new servo is mounted the same way and re-commissions the profile, acknowledging every point up to high fire.
2Drive deselected
- Points to it
- After option parameter changes; subset is a drive number.
- Check
- Restore the drive selection or re-commission the profile without it.
3Profile uploaded but not verified
- Points to it
- After restoring settings from ComFire2 or a PC.
- Check
- Verify the profile on the burner in Commission Ratio mode.
Telling it apart
- F64 blocks a profile before firing; a drive position fault (F20 and up) happens when a valid profile’s drive misses its set point.
Evidence to collect
- Subset
- Recent servo, parameter or profile changes
Work on fuel trains, burners, pressure vessels and electrical equipment must be done by qualified personnel following the manufacturer’s documentation and local codes. Never bypass a safety device or interlock.