Burner controls, ignition and flame safeguards
Fireye MicroM Flame Safeguard (MC-5000) fault codes
What all 18 Fireye MicroM Flame Safeguard (MC-5000) 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 November 4, 2026
| Code | What it means | Risk |
|---|---|---|
| 6 | Lockout Line Frequency Noise Detected Electrical noise or spikes were detected on the main power, locking out the burner control. | RED |
| 7 | Lockout Flame Fail - PTFI The pilot flame was not detected during the trial period, locking out the burner system. | RED |
| 15 | Lockout Fault Unknown An unknown fault has occurred, causing the control module to lock out the burner system. | RED |
| 16 | Lockout Amplifier High Count Fail The amplifier signal level is abnormally high, forcing the burner control into a lockout state. | RED |
| 19 | Lockout Flame Fail - MTFI The main flame was not detected during the trial period, locking out the burner system. | RED |
| 20 | Lockout False Flame - STANDBY A false flame was detected during standby or purge, preventing the burner from starting up. | RED |
| 21 | Lockout Intrlck Open The running interlock switch opened or failed to close, locking out the burner control system. | RED |
| 22 | Lockout Intrlck Closed The interlock switch was detected as closed when it was expected open, preventing burner startup. | RED |
| 24 | Lockout Chassis Opto The chassis opto-couplers have short circuited, forcing the burner control into a lockout state immediately. | RED |
| 37 | Lockout Flame Fail - AUTO A flame failure occurred during the main firing period, locking out the burner control system. | RED |
| 39 | Lockout Main Valve Voltage was detected on the main fuel valve during pilot ignition, locking out the burner. | RED |
| 54 | Lockout Check Chassis Improper voltage timing or a welded relay was detected, locking out the burner control system. | RED |
| 55 | Lockout Check Programmer Improper voltage timing or an internal diagnostic failure occurred, locking out the burner control system. | RED |
| 56 | Lockout Check Amplifier The amplifier module failed its internal diagnostic tests, forcing the burner into a lockout state. | RED |
| 58 | Lockout Amplifier Auto Check Fail The flame signal is too high or an internal fault occurred, locking out the burner. | RED |
| 59 | Lockout Check BLOWN FUSE A blown fuse or defective pilot component was detected, locking out the burner control system. | RED |
| 76 | Lockout Check Scanner A defective scanner shutter or false firing UV tube was detected, locking out the burner. | RED |
| N/A | System Error A system error occurred due to an electrical noise transient, locking out the burner control. | RED |
Every code comes from the manufacturer's own manual. Subscribers see which manual and page.