York TM9V100C20MP11 100,000 BTU 96% AFUE 2-Stage Variable-Speed Gas Furnace FD Error Fix: Flame Detection Failure

The furnace's flame sensor failed to detect flame after ignition, causing shutdown to prevent unsafe gas flow. This may be due to sensor contamination or wiring faults.

critical2 fixes available

Quick Answer

Error FD on the York TM9V100C20MP11 100,000 BTU 96% AFUE 2-Stage Variable-Speed Gas Furnace means: Flame Detection Failure. The top-ranked community fix is “Replace Flame Sensor and Inspect Wiring” (medium difficulty, ~35 min, DIY cost: $12-$18). 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: $100-$160.

Other York TM9V100C20MP11 100,000 BTU 96% AFUE 2-Stage Variable-Speed Gas Furnace Error Codes

Burner Blocked

2 fixes

Blower Fault

2 fixes

Control Board Failure

2 fixes

CF1

Circulation Fan Fault

Exhaust Blockage

Filter Fault

Flame Lockout

Flame Sensor Shorted

People Also Ask About York TM9V100C20MP11 100,000 BTU 96% AFUE 2-Stage Variable-Speed Gas Furnace Error FD

What does error code FD mean on a York TM9V100C20MP11 100,000 BTU 96% AFUE 2-Stage Variable-Speed Gas Furnace?

Error code FD on the York TM9V100C20MP11 100,000 BTU 96% AFUE 2-Stage Variable-Speed Gas Furnace means: Flame Detection Failure. The furnace's flame sensor failed to detect flame after ignition, causing shutdown to prevent unsafe gas flow. This may be due to sensor contamination or wiring faults.

How do I fix error code FD on my York TM9V100C20MP11 100,000 BTU 96% AFUE 2-Stage Variable-Speed Gas Furnace?

The most successful fix is "Replace Flame Sensor and Inspect Wiring" (medium difficulty, ~35 minutes). Estimated DIY cost: $12-$18. HomeMD has 2 community-ranked fixes for this error.

Is error code FD on a York TM9V100C20MP11 100,000 BTU 96% AFUE 2-Stage Variable-Speed 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 TM9V100C20MP11 100,000 BTU 96% AFUE 2-Stage Variable-Speed Gas Furnace error FD myself?

Yes — the top-ranked community fix ("Replace Flame Sensor and Inspect Wiring") is rated medium difficulty and takes about 35 minutes. Tools needed: Phillips screwdriver, Wire strippers, Multimeter.

How much does it cost to repair York TM9V100C20MP11 100,000 BTU 96% AFUE 2-Stage Variable-Speed Gas Furnace error FD?

DIY cost: $12-$18. Professional repair typically costs $100-$160. Many homeowners save money by trying the top-ranked community fix first.

What other error codes does the York TM9V100C20MP11 100,000 BTU 96% AFUE 2-Stage Variable-Speed Gas Furnace have?

The York TM9V100C20MP11 100,000 BTU 96% AFUE 2-Stage Variable-Speed Gas Furnace has 8 other known error codes, including: BB (Burner Blocked), BF (Blower Fault), CF (Control Board Failure), CF1 (Circulation Fan Fault), EB (Exhaust Blockage), and 3 more.

What other error codes does the York TM9V100C20MP11 100,000 BTU 96% AFUE 2-Stage Variable-Speed Gas Furnace have?

The York TM9V100C20MP11 100,000 BTU 96% AFUE 2-Stage Variable-Speed Gas Furnace has 8 other known error codes:

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