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Trane · XR80 80% AFUE Single-Stage Gas Furnace

Trane XR80 80% AFUE Single-Stage Gas Furnace E4 Error Fix: Flame Sensor Fault

The flame sensor did not detect a flame during burner operation, which may indicate a dirty sensor or poor flame. The furnace shuts down to prevent gas buildup.

High severity2 fixes available

Quick Answer

Error E4 on the Trane XR80 80% AFUE Single-Stage Gas Furnace means: Flame Sensor Fault. The top-ranked community fix is “Replace Flame Sensor Assembly” (medium difficulty, ~30 min, DIY cost: $40-$60). 2 community-ranked fixes available below.

Published February 2026 · 2 fixes · furnace

Content is based on manufacturer service documentation, community repair experience, and OEM technical bulletins. Always verify with your owner's manual.Learn about our editorial standards.

Root Cause Analysis

Sensor MalfunctionPrimary

When to Call a Professional

While many furnace repairs can be done safely at home, consider hiring a qualified technician if:

This is a high severity error — continued use may cause damage or a safety hazard
The repair involves electrical wiring, gas lines, or refrigerant
You've tried the top-ranked fix and the error persists
You smell gas, see sparking, or notice water leaking
The repair requires specialized tools you don't have
Your appliance is still under manufacturer warranty

Average professional repair cost for this issue: $140-$210.

Other Trane Models with Error E4

XR15 3 Ton 15 SEER Single-Stage Air Conditioner with Spine Fin Coil

air_conditioner · 2 fixes

Other Trane XR80 80% AFUE Single-Stage Gas Furnace Error Codes

Pressure Switch Failure

2 fixes

E10

Inducer Pressure Switch Stuck Closed

2 fixes

E11

Rollout Switch Tripped

2 fixes

E12

Ignitor Short Circuit

Limit Circuit Open

Draft Inducer Pressure Switch Not Closing

2 fixes

E15

Ignition Transformer Fault

2 fixes

Limit Switch Open

2 fixes

People Also Ask About Trane XR80 80% AFUE Single-Stage Gas Furnace Error E4

What does error code E4 mean on a Trane XR80 80% AFUE Single-Stage Gas Furnace?

Error code E4 on the Trane XR80 80% AFUE Single-Stage Gas Furnace means: Flame Sensor Fault. The flame sensor did not detect a flame during burner operation, which may indicate a dirty sensor or poor flame. The furnace shuts down to prevent gas buildup.

How do I fix error code E4 on my Trane XR80 80% AFUE Single-Stage Gas Furnace?

The most successful fix is "Replace Flame Sensor Assembly" (medium difficulty, ~30 minutes). Estimated DIY cost: $40-$60. HomeMD has 2 community-ranked fixes for this error.

Is error code E4 on a Trane XR80 80% AFUE Single-Stage Gas Furnace serious?

This error is rated high severity. You should address it promptly — continued use could cause damage or safety concerns.

Can I fix Trane XR80 80% AFUE Single-Stage Gas Furnace error E4 myself?

Yes — the top-ranked community fix ("Replace Flame Sensor Assembly") is rated medium difficulty and takes about 30 minutes. Tools needed: Screwdriver, Multimeter.

How much does it cost to repair Trane XR80 80% AFUE Single-Stage Gas Furnace error E4?

DIY cost: $40-$60. Professional repair typically costs $140-$210. Many homeowners save money by trying the top-ranked community fix first.

What other error codes does the Trane XR80 80% AFUE Single-Stage Gas Furnace have?

The Trane XR80 80% AFUE Single-Stage Gas Furnace has 8 other known error codes, including: E1 (Pressure Switch Failure), E10 (Inducer Pressure Switch Stuck Closed), E11 (Rollout Switch Tripped), E12 (Ignitor Short Circuit), E13 (Limit Circuit Open), and 3 more.

Which other Trane models have the E4 error?

Error code E4 also appears on 1 other Trane model: XR15 3 Ton 15 SEER Single-Stage Air Conditioner with Spine Fin Coil. The fix may vary by model, so check each model's specific page for tailored repair steps.

What other error codes does the Trane XR80 80% AFUE Single-Stage Gas Furnace have?

The Trane XR80 80% AFUE Single-Stage Gas Furnace has 8 other known error codes:

E1 — Pressure Switch Failure (2 fixes)
E10 — Inducer Pressure Switch Stuck Closed (2 fixes)
E11 — Rollout Switch Tripped (2 fixes)
E12 — Ignitor Short Circuit (2 fixes)
E13 — Limit Circuit Open (2 fixes)
E14 — Draft Inducer Pressure Switch Not Closing (2 fixes)
E15 — Ignition Transformer Fault (2 fixes)
E2 — Limit Switch Open (2 fixes)

Which other Trane models have the E4 error?

Error code E4 also appears on 1 other Trane model:

XR15 3 Ton 15 SEER Single-Stage Air Conditioner with Spine Fin Coil (air conditioner) · 2 fixes

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