🔥Furnace

E18

York · TM8E100C20MP11 100,000 BTU 80% AFUE Single-Stage Upflow Gas Furnace

York TM8E100C20MP11 100,000 BTU 80% AFUE Single-Stage Upflow Gas Furnace E18 Error Fix: Flame Signal Lost During Operation

The flame signal was lost during furnace operation, which may be caused by flame sensor failure, wiring issues, or control board error.

critical2 fixes available

Quick Answer

Error E18 on the York TM8E100C20MP11 100,000 BTU 80% AFUE Single-Stage Upflow Gas Furnace means: Flame Signal Lost During Operation. The top-ranked community fix is “Replace Flame Sensor” (medium difficulty, ~45 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

Electrical Fault → Wiring Harness Damaged

When to Call a Professional

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

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: $120-$180.

Other York Models with Error E18

DERA-P036N07 HP 16 SEER

heat_pump · 2 fixes

GM9S080B12MP11 80,000 BTU 96% AFUE Single-Stage Upflow Gas Furnace

furnace · 2 fixes

TM9V080B12MP11 80,000 BTU 96% AFUE 2-Stage Variable-Speed Gas Furnace

furnace · 2 fixes

YCG42B21S 3.5 Ton 14 SEER Affinity Series Air Conditioner with Scroll Compressor

air_conditioner · 2 fixes

YHG42B21S 3.5 Ton 14 SEER 10 HSPF Affinity Series Heat Pump with Variable-Speed Compressor

heat_pump · 2 fixes

YZH36B21S 3 Ton 16 SEER 9.5 HSPF Heat Pump with Environmentally Friendly Refrigerant

heat_pump · 2 fixes

Other York TM8E100C20MP11 100,000 BTU 80% AFUE Single-Stage Upflow Gas Furnace Error Codes

Ignition Failure

Flame Sensor Failure

Pressure Switch Open

Inducer Motor Failure

2 fixes

E05

High Limit Switch Open

Limit Switch Shorted

Gas Valve Solenoid Fault

2 fixes

E08

Control Board Failure

2 fixes

People Also Ask About York TM8E100C20MP11 100,000 BTU 80% AFUE Single-Stage Upflow Gas Furnace Error E18

What does error code E18 mean on a York TM8E100C20MP11 100,000 BTU 80% AFUE Single-Stage Upflow Gas Furnace?

Error code E18 on the York TM8E100C20MP11 100,000 BTU 80% AFUE Single-Stage Upflow Gas Furnace means: Flame Signal Lost During Operation. The flame signal was lost during furnace operation, which may be caused by flame sensor failure, wiring issues, or control board error.

How do I fix error code E18 on my York TM8E100C20MP11 100,000 BTU 80% AFUE Single-Stage Upflow Gas Furnace?

The most successful fix is "Replace Flame Sensor" (medium difficulty, ~45 minutes). Estimated DIY cost: $40-$60. HomeMD has 2 community-ranked fixes for this error.

Is error code E18 on a York TM8E100C20MP11 100,000 BTU 80% AFUE Single-Stage Upflow Gas Furnace serious?

This error is rated critical severity. It is generally not urgent and can often be resolved with a simple DIY fix.

Can I fix York TM8E100C20MP11 100,000 BTU 80% AFUE Single-Stage Upflow Gas Furnace error E18 myself?

Yes — the top-ranked community fix ("Replace Flame Sensor") is rated medium difficulty and takes about 45 minutes. Tools needed: Phillips screwdriver, Multimeter.

How much does it cost to repair York TM8E100C20MP11 100,000 BTU 80% AFUE Single-Stage Upflow Gas Furnace error E18?

DIY cost: $40-$60. Professional repair typically costs $120-$180. Many homeowners save money by trying the top-ranked community fix first.

What other error codes does the York TM8E100C20MP11 100,000 BTU 80% AFUE Single-Stage Upflow Gas Furnace have?

The York TM8E100C20MP11 100,000 BTU 80% AFUE Single-Stage Upflow Gas Furnace has 8 other known error codes, including: E01 (Ignition Failure), E02 (Flame Sensor Failure), E03 (Pressure Switch Open), E04 (Inducer Motor Failure), E05 (High Limit Switch Open), and 3 more.

Which other York models have the E18 error?

Error code E18 also appears on 6 other York models: DERA-P036N07 HP 16 SEER, GM9S080B12MP11 80,000 BTU 96% AFUE Single-Stage Upflow Gas Furnace, TM9V080B12MP11 80,000 BTU 96% AFUE 2-Stage Variable-Speed Gas Furnace, YCG42B21S 3.5 Ton 14 SEER Affinity Series Air Conditioner with Scroll Compressor, YHG42B21S 3.5 Ton 14 SEER 10 HSPF Affinity Series Heat Pump with Variable-Speed Compressor, YZH36B21S 3 Ton 16 SEER 9.5 HSPF Heat Pump with Environmentally Friendly Refrigerant. The fix may vary by model, so check each model's specific page for tailored repair steps.

What other error codes does the York TM8E100C20MP11 100,000 BTU 80% AFUE Single-Stage Upflow Gas Furnace have?

The York TM8E100C20MP11 100,000 BTU 80% AFUE Single-Stage Upflow Gas Furnace has 8 other known error codes:

E01 — Ignition Failure (2 fixes)
E02 — Flame Sensor Failure (2 fixes)
E03 — Pressure Switch Open (2 fixes)
E04 — Inducer Motor Failure (2 fixes)
E05 — High Limit Switch Open (2 fixes)
E06 — Limit Switch Shorted (2 fixes)
E07 — Gas Valve Solenoid Fault (2 fixes)
E08 — Control Board Failure (2 fixes)

Which other York models have the E18 error?

Error code E18 also appears on 6 other York models:

DERA-P036N07 HP 16 SEER (heat pump) · 2 fixes
GM9S080B12MP11 80,000 BTU 96% AFUE Single-Stage Upflow Gas Furnace (furnace) · 2 fixes
TM9V080B12MP11 80,000 BTU 96% AFUE 2-Stage Variable-Speed Gas Furnace (furnace) · 2 fixes
YCG42B21S 3.5 Ton 14 SEER Affinity Series Air Conditioner with Scroll Compressor (air conditioner) · 2 fixes
YHG42B21S 3.5 Ton 14 SEER 10 HSPF Affinity Series Heat Pump with Variable-Speed Compressor (heat pump) · 2 fixes
YZH36B21S 3 Ton 16 SEER 9.5 HSPF Heat Pump with Environmentally Friendly Refrigerant (heat pump) · 2 fixes

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