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Trane / American Standard A801X Furnace Codes
Uses the same integrated furnace control codes as the S8 series, without the second-stage codes. The A801X060AM3S has a different control and its own chart.
| Code | Meaning | What to check |
|---|---|---|
| E01 | Loss of the IRQ or other internal failures (internal IFC error). | |
| E2.1 | Retry exceeded: flame never sensed. One-hour lockout after 3 times. | How to fix → |
| E2.2 | Recycles exceeded: flame sensed then lost. One-hour lockout after 10 times. | How to fix → |
| E2.3 | 1st-stage gas valve not energized when it should be, exceeded after 10 times. | How to fix → |
| E3.1 | Shorted pressure switch, 1st stage. | How to fix → |
| E3.2 | Open pressure switch, 1st stage. | On the A801X the pressure switch is connected to the hot header; the manual says to disregard tubing connected to the inducer. Verify pressure switch wiring and tube routing. How to fix → |
| E04 | Open limit (main thermal, rollout switch, or reverse airflow switch). | How to fix → |
| E05 | Flame detected, should not be present. | How to fix → |
| E6.1 | Voltage reversed polarity. | |
| E6.2 | Bad grounding. | |
| E6.3 | Igniter relay fails, or igniter open. | How to fix → |
| E7.1 | 1st-stage gas valve (MVL) is energized when it should be off. | |
| E08 | Flame current is low, but still strong enough to allow operation. | How to fix → |
| E11 | 1st-stage gas valve not energized when it should be, or 1st-stage gas valve relay stuck closed. | How to fix → |
| E12 | Open fuse. | How to fix → |
How to read the codes
- 'IdL' means idle, no thermostat demand. 'Err' is the active alarm menu.
- Last 6 faults: press Menu until 'L6F' appears, press Option to enter, and the last 6 faults can be viewed. To clear them, enter L6F and hold Option for at least 5 seconds; three sets of dashes confirm they were cleared.
- Factory defaults: in Idle, press Menu and Option together for 15 seconds; 'Fd' flashes 3 times.
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, Operation, and Maintenance, A801X single-stage gas furnaces, A801X-SVX001-1D-EN (August 2024), Integrated Furnace Control Display Codes, pp. 48-49. 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 A801X060AM3S (80% single-stage, 2024 installation manual)
- 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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