Fireye E110 Lockout Messages: Causes and Fixes
When a Fireye E110 Flame-Monitor trips or locks out, identifying the exact cause quickly is critical to restoring safe burner operation. Whether you are reading error messages on an ED510 display or diagnosing interlock strings, getting the right diagnosis prevents prolonged downtime and combustion hazards. This guide provides a complete reference for Fireye E110 lockout messages, reset procedures, common failure modes, and replacement parts.
Table of Contents
- → 1. Fireye E110 Lockout Messages
- → 2. Resetting a Lockout
- → 3. The Complete E110 Lockout Message Table
- → 4. The Lockouts You’ll Actually See
- → 5. When the Message Means Hardware
- → 6. E110 Replacement Parts Quick Reference
- → 7. Get the Burner Back Up: Source Your Replacement From TCI Supply
- → Frequently Asked Questions
1. Fireye E110 Lockout Messages
When a Fireye E110 Flame-Monitor locks out, the burner shuts down, the alarm terminal energizes, and the ED510 display shows LOCKOUT with the reason on the second line. This page lists the E110 lockout messages with causes and corrective actions.
The messages apply to the E110 Flame-Monitor system: the EB700 chassis with an EP or EPD programmer module, a plug-in flame amplifier, and the ED510 display. Exact message wording varies slightly by programmer model; the messages below are shown for the EP160 family, the most common configuration. The E110 replaced the E100 and shares its wiring base with the older D Series and C Series controls, so many burners running this control started life with something older. If your control is a MicroM or M-Series II, the diagnostics are LED-based rather than displayed messages, and the codes differ.
2. Resetting a Lockout
To reset the control, momentarily press the reset button on the ED510 display, or use the remote reset if one is wired. The control’s non-volatile memory retains the lockout condition through power failures, so cycling power does not clear it.
A lockout indicates the control detected an unsafe condition. Resetting clears the message, not the condition. Repeated resets after a flame failure put unburned fuel into the combustion chamber, which creates an explosion hazard. Reset once, observe the startup sequence, and record where in the sequence the failure occurs and what message results. The control stores the last six lockouts with the burner cycle and burner hour at which each occurred, under the LOCKOUT HISTORY sub-menu. Faults cleared by an operator before you arrived are still recorded there.
If the same message returns, diagnose before resetting again. Never jumper an interlock, switch, or flame signal to keep a burner running. Flame safeguard service should be performed by a qualified burner technician.
3. The Complete E110 Lockout Message Table
Messages are grouped by type: flame faults, interlock faults, and system diagnostic faults. The flame signal reading on the ED510 must be above the minimum threshold of 10 for the control to recognize flame. Source: Fireye bulletin E-1101.
| Lockout message | Cause | Corrective action |
|---|---|---|
| LOCKOUT FLAME FAIL – PTFI | No flame proven, or flame lost, during the 10-second Pilot Trial for Ignition. | Check pilot gas pressure, ignition transformer, and electrode. Verify flame signal above 10 during a supervised trial with the Check-Run switch in Check. Clean the scanner lens and verify sighting. Verify amplifier matches the scanner type. |
| LOCKOUT FLAME FAIL – MTFI | Flame lost during the Main Trial for Ignition. | Check main fuel valves, fuel pressure, and valve operation. Verify scanner sighting reads the main flame, not just the pilot. Run the minimum pilot test. |
| LOCKOUT FLAME FAIL – AUTO | Main flame lost during the run period. | Check fuel supply and pressure. Verify flame signal is stable and above 10 across the firing range. Check for scanner contamination or a failing UV tube. |
| LOCKOUT FALSE FLAME – STANDBY | Flame sensed during burner off time, or for 60 seconds during purge. | Verify no flame or glowing refractory is in the chamber. Check for a failed scanner or amplifier reporting flame continuously. Route scanner wiring away from ignition cables. |
| LOCKOUT 3-P AIR FLOW OPEN | The running interlock circuit (terminal 3 to P), which includes the airflow switch, opened or failed to close. | Verify the combustion fan runs and the airflow switch proving line is clear. Check every switch in the 3-P string: limits, fuel pressure switches, airflow. Verify voltage across the string during purge. |
| LOCKOUT D-8 LIMIT OPEN | High fire purge switch (terminal D to 8) failed to close within 10 minutes. | Drive the damper to high fire and adjust the end switch. Check damper motor operation and linkage. Do not connect power-consuming devices to the D or 8 terminals. |
| LOCKOUT M-D LIMIT OPEN | Low fire start switch (terminal M to D) failed to close within 10 minutes after purge. | Drive the firing rate motor to low fire and adjust the switch. Check the modulating motor and linkage. |
| LOCKOUT FUEL VALVE OPEN | Fuel valve end switch (terminal 13 to 3) open at startup; the main valve stem is not proven closed. | Verify the main fuel valve is fully closed and the end switch is adjusted. Check wiring between terminals 13 and 3. |
| LOCKOUT LINE FREQUENCY NOISE DETECTED | Excess electrical noise or line frequency deviation. | Verify line voltage and frequency at L1-L2. Check earth grounding per the bulletin’s grounding rules. Route ignition and scanner cables separately. |
| LOCKOUT SCANNER NOISE | Electrical noise on the scanner circuit. | Route scanner wiring away from ignition cables and motor contactors. Check scanner cable shield and grounding. |
| LOCKOUT CHECK SCANNER | Scanner fault detected (self-check systems). | Check 45UV5 shutter operation and wiring. Replace the scanner if the shutter motor has failed. See the hardware section below. |
| LOCKOUT AMPLIFIER AUTO CHECK FAIL | The amplifier failed its diagnostic self-check. | Replace the amplifier. |
| LOCKOUT CHECK AMPLIFIER | Amplifier fault detected. | Reseat the amplifier module. Replace the amplifier if the fault returns. |
| LOCKOUT CHECK PROGRAMMER | Programmer module fault. | Reseat the programmer module. Replace the programmer if the fault returns. |
| LOCKOUT CHECK CHASSIS | Chassis (EB700) fault. | Check wiring base connections. Replace the EB700 chassis if the fault returns. |
| LOCKOUT CHECK EXPANSION MODULE | E300 Expansion Module fault, including a defective optocoupler. | Check E300 wiring and cable. Replace the E300 Expansion Module. |
Two display conditions are not lockouts. FIREYE ED510 WAITING FOR DATA means the display is not receiving data from the programmer; check the display seating and the programmer. FIREYE ED510 SYSTEM ERROR indicates a defective programmer; replace the programmer module.
4. The Lockouts You’ll Actually See
Three fault families account for most E110 service calls.
Flame fail at PTFI, MTFI, or AUTO
- Place the Check-Run switch in Check at the start of PTFI and read the flame signal on the ED510. The minimum acceptable signal is 10. Below that, the control will not recognize flame.
- Check the scanner. Clean the lens with a soft cloth and detergent; even light contamination measurably reduces signal. Verify the sighting tube points at the first third of the flame envelope and does not extend more than halfway into the refractory.
- On a 45UV5 self-check scanner, listen for the rhythmic clicking of the shutter motor. Clicking with a low or erratic signal means the UV tube is failing. No clicking means the shutter motor or its drive has failed. Either way the scanner needs service; our 45UV5 page covers replacement models and UV tubes.
- Check pilot gas pressure, ignition transformer, and electrode gap. Run the minimum pilot test after any pilot adjustment.
- Verify the amplifier matches the scanner and is seated. Replace the amplifier, then the scanner, if the signal cannot be brought above 10.
False flame at standby or purge
- Confirm no flame or glowing refractory is present. Hot refractory holds UV scanners in.
- Check for ignition noise coupling. Scanner cables must run away from ignition cables and motor contactors.
- Replace the amplifier if the control reports flame with the scanner disconnected.
Air flow and running interlock (3-P)
- Verify the fan runs and the airflow switch sensing line is clear. A plugged sensing line is the most common airflow switch failure.
- Work the 3-P string switch by switch: operating limits, fuel pressure switches, airflow switch. Measure across each to find the open one.
- If the lockout occurs at the same sequence point every cycle, note the timing. An interlock that opens only at high fire points at a pressure switch or damper problem, not wiring.
- Do not jumper the string to isolate a switch and leave it in service. Find the open switch and replace it.
5. When the Message Means Hardware
The E110 is fully modular. Field wiring lands on the 18-terminal wiring base, and every active component plugs in: the EB700 chassis, the EP or EPD programmer, the flame amplifier, and the ED510 display. A hardware diagnosis is a plug-in swap, and the wiring base stays in place.
Programmer module (EP160, EP170, EPD160, and related). LOCKOUT CHECK PROGRAMMER and ED510 SYSTEM ERROR point here. The programmer sets purge timing, trial timings, and recycle behavior, so the replacement must be the same model.
Flame amplifier. LOCKOUT CHECK AMPLIFIER and AMPLIFIER AUTO CHECK FAIL point here. The amplifier must match the scanner: EUV1 for UV1A, UV8A, UV2, and 45UV3 scanners; EUVS4 for the self-check 45UV5; ERT1 for 69ND1 flame rods; E1R1 for the 48PT2 infrared. Our E110 components guide covers the pairings in full.
Scanner. LOCKOUT CHECK SCANNER, plus recurring flame fails with a verified low signal. UV tubes lose sensitivity gradually with age; a signal that has drifted down over months is a tube, not a wiring problem.
Chassis and display. LOCKOUT CHECK CHASSIS points at the EB700. A dark or scrambled ED510 is a display or seating problem, not a lockout; the control runs without the display on EPD programmers.
6. E110 Replacement Parts Quick Reference
Common E110 system components. Every part below is something we stock or source.
| Part number | What it is | When you need it |
|---|---|---|
| E110 (EB700) | Flame-Monitor chassis with dust cover | LOCKOUT CHECK CHASSIS; complete control replacement |
| EP160 | Programmer module, 30 second purge | LOCKOUT CHECK PROGRAMMER, SYSTEM ERROR |
| EP170 | Programmer module, 90 second purge | Programmer replacement, longer purge applications |
| ED510 | Display module, 2×16 LCD | Dark or scrambled display; required with EP programmers |
| EUV1 | Standard UV amplifier | CHECK AMPLIFIER with UV1A, UV8A, UV2, 45UV3 scanners |
| EUVS4 | Self-check UV amplifier | CHECK AMPLIFIER or AUTO CHECK FAIL with 45UV5 scanners |
| ERT1 | Rectification amplifier | CHECK AMPLIFIER with 69ND1 flame rods |
| UV1A | UV flame scanner | Low flame signal after amplifier checks out |
| 45UV5 Series | Self-check UV scanners and UV tubes | CHECK SCANNER, failed shutter motor, worn UV tube |
| 69ND1 | Flame rod, 12, 18, or 24 inch | Flame rod replacement on rectification systems |
The amplifier and scanner must match; verify the pairing before ordering either half. For displays, expansion modules, and communication accessories, see our Fireye flame safeguard accessories page.
7. Get the Burner Back Up: Source Your Replacement From TCI Supply
If the diagnosis landed on hardware, send us the part numbers from your chassis, programmer, amplifier, and scanner along with the lockout message. We’ll confirm the exact replacement and get it moving. We stock the common E110 system components and source discontinued Fireye parts through the secondary market. Flame safeguard replacement should be installed and commissioned by a qualified burner technician. Contact TCI Supply or call us at 1-800-755-2883.