York TM9V100C20MP11 100,000 BTU 96% AFUE 2-Stage Variable-Speed Gas Furnace HB Error Fix: Heat Exchanger Blocked

The heat exchanger is blocked or cracked, causing poor heat transfer and potential safety hazards. The furnace will shut down to prevent damage or carbon monoxide leaks.

critical2 fixes available

Quick Answer

Error HB on the York TM9V100C20MP11 100,000 BTU 96% AFUE 2-Stage Variable-Speed Gas Furnace means: Heat Exchanger Blocked. The top-ranked community fix is “Replace Heat Exchanger Assembly” (hard difficulty, ~180 min, DIY cost: $600-$800). 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

Mechanical WearPrimary

Seal/Gasket Failure

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: $1200-$1600.

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

2 fixes

Exhaust Blockage

2 fixes

Flame Detection Failure

2 fixes

Filter Fault

2 fixes

Flame Lockout

2 fixes

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

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

Error code HB on the York TM9V100C20MP11 100,000 BTU 96% AFUE 2-Stage Variable-Speed Gas Furnace means: Heat Exchanger Blocked. The heat exchanger is blocked or cracked, causing poor heat transfer and potential safety hazards. The furnace will shut down to prevent damage or carbon monoxide leaks.

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

The most successful fix is "Replace Heat Exchanger Assembly" (hard difficulty, ~180 minutes). Estimated DIY cost: $600-$800. HomeMD has 2 community-ranked fixes for this error.

Is error code HB 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 HB myself?

Yes — the top-ranked community fix ("Replace Heat Exchanger Assembly") is rated hard difficulty and takes about 180 minutes. Tools needed: Phillips screwdriver, Wrenches, Multimeter.

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

DIY cost: $600-$800. Professional repair typically costs $1200-$1600. 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:

Ad Space — banner

Replace ADSENSE_PUBLISHER_ID in AdUnit.tsx