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Trane / American Standard A801X060AM3S Furnace Codes
This chart is for the A801X060AM3S, whose 2024 manual uses two-character codes (E1, FE, Pr...). Other A801X models with the integrated furnace control use E2.1-style codes; check the code list on the unit's wiring diagram.
| Code | Meaning | What to check |
|---|---|---|
| FE | Gas valve relay stuck closed. | Verify the gas valve is operating and shutting down properly; the burner flame should go out promptly at the end of the cycle. Check orifices and gas pressure. How to fix → |
| E1 | Shorted pressure switch. | Pressure switch stuck closed. Check switch function and verify the inducer is turning off. How to fix → |
| E2 | Open pressure switch. | Check pressure switch function and tubing. Verify the inducer is turning on and pulling enough vacuum to close the switch. How to fix → |
| E4 | Open pressure switch, locked. | If the pressure switch cycles 15 times (open, closed) during one call for heat, the control locks out. Check the switch for fluttering, inconsistent closure or poor vacuum. How to fix → |
| E5 | Open thermal limit or rollout switch. | Verify continuity through the rollout switch, primary limit and reverse flow limit circuit. How to fix → |
| E6 | Open thermal limit or rollout switch, after 5 times. | Verify continuity through the rollout switch, primary limit and reverse flow limit circuit. Find out why it keeps opening before resetting. How to fix → |
| E7 | Ignition failure, locked. | Failure to sense flame is often caused by carbon deposits on the flame sensor, a disconnected or shorted sensor lead, or a poorly grounded furnace. Verify the sensor isn't touching the burner and sits where it can sense flame. How to fix → |
| E8 | Flame loss, locked. | Check the same items as for E7, and verify the gas valve isn't dropping out so the flame is established and then lost. How to fix → |
| FL | Flame low. | Low flame sense current, often from carbon on the sensor, a poorly grounded furnace or a misaligned sensor. Clean the sensor with emery cloth and check furnace and control grounding. How to fix → |
| Pr | Power reversed. | Verify the control and furnace are properly grounded. Check line-voltage polarity and correct it if reversed. |
| Fo | Fuse open. | Low-voltage circuit overcurrent. Find and repair the shorted wiring or component, then replace the fuse. How to fix → |
| bE | Board error. | Replace the electronic control board. |
| nL | Signal error. | Check the control signal wiring against the user manual. |
How to read the codes
- The display shows the code for the active fault. Look it up below, then check the circuit it names.
- The control automatically tries to reset from lockout after one hour.
- The code clears if power to the control is interrupted at the disconnect or the door switch, so read it before opening the blower door.
Codes point to a circuit, not a part. Test before replacing anything, and never jumper a limit, rollout or pressure switch to keep a furnace running. Gas and line-voltage work is for trained technicians.
Source: Trane Installation Manual, A801X060AM3S*** upflow/horizontal and downflow gas furnaces, 88-A801X004-1B-EN (11/2024), Table 13-1 Troubleshooting Chart. The "meaning" column follows the manufacturer's wording; "what to check" is our field summary. Always go by the label on the furnace you're working on.
Related
- How to read furnace LED flash codes
- Furnace pressure switch troubleshooting
- Flame sensor microamps and cleaning
Other brands
- Lennox Merit ML180UH (80% single-stage)
- Carrier 58CVA / 58CVX (80% variable-speed two-stage)
- Rheem / Ruud R96V / 96MDV (96% two-stage communicating)
- Goodman / Amana GR9S80 / GD9S80 (80% single-stage)
- Trane / American Standard S9X1 / S9X2 / S9B1 (96% condensing)
- Lennox SL280UHV (80% two-stage variable speed)
- Goodman / Amana / Daikin GM9S96 / GC9S96 / GM9S92 (96% and 92% condensing, single-stage)
- Carrier 59TP6C two-stage condensing with InteliSense (Performance series)
- Lennox G60DF / G60DFV (older two-stage SureLight boards 18M3401, 46M9901, 18M9901, 49M5901)
- Lennox G60UH / G60UHV (SureLight boards 100869 and 100870)
- Rheem / Ruud R801T Ultra Low NOx (14 ng/J) single-stage upflow/horizontal, constant-torque blower
- Rheem / Ruud 802V / 80MDV (80% two-stage communicating, ECM blower; model numbers (-)802V and (-)(-)80MDV)
- Trane / American Standard S8B1 / S8X1 / S8X2 (80% single-stage and two-stage)
- Trane / American Standard A801X (80% single-stage: A801X040AM3SD, A801X040BM2SD, A801X060BM4SD, A801X080BM4SD, A801X080CM5SD, A801X100CM5SD, A801X120DM5SD)
- Goodman / Amana GMVC96 / GCVC96 (96% two-stage variable-speed, *MVC96*BA and *CVC96*BA)
- Goodman / Amana GMVS96 / AMVS96 U-revision (96% variable-speed with analog pressure sensor, model numbers GMVS96*U and AMVS96*U)
- Goodman / Amana GMVM96 / GCVM96 / AMVM96 / ACVM96 (96% modulating, model numbers *MVM96 and *CVM96)
- Rheem / Ruud R801T / 80MSX (80% single-stage, constant-torque blower; model numbers (-)801T and (-)(-)80MSX)
- Rheem / Ruud 802P / 80MDP (80% two-stage, model numbers (-)802P and (-)(-)80MDP)
- Rheem / Ruud 802T / 80MDT (80% two-stage with constant-torque blower, model numbers (-)802T and (-)(-)80MDT)
- Rheem / Ruud 801S / 801P / 80MSS / 80MSP (80% single-stage, model numbers (-)801S, (-)801P, (-)(-)80MSS and (-)(-)80MSP)
- Rheem / Ruud W801T (Rheem Select 80% downflow single-stage)
- Rheem / Ruud R951T (95% single-stage condensing, constant-torque blower; model numbers (-)951T)
- Rheem / Ruud 801V Ultra Low NOx (80% communicating, constant CFM blower, upflow/horizontal)
- Carrier 58STA / 58STX (80% single-stage, 4-way multipoise)
- Carrier 58SB0A / 58SB1A (single-stage, non-condensing)
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