🔥Furnace

CRACKED HEAT EXCHANGER

Lennox · EL296V Elite Series 96% AFUE Two-Stage Variable Speed Gas Furnace

Lennox EL296V Elite Series 96% AFUE Two-Stage Variable Speed Gas Furnace CRACKED HEAT EXCHANGER Error Fix: Cracked Heat Exchanger

The heat exchanger has developed a crack or hole, allowing combustion gases including carbon monoxide to mix with household air. Most serious furnace safety issue. Symptoms: flame rollout switch tripping, visible flame disturbance when blower starts, CO detector alarms, sooty residue around burners. Lennox furnaces carry a 20-year limited heat exchanger warranty. Requires immediate shutdown and replacement.

critical2 fixes available✨ Free fix available

Quick Answer

Error CRACKED HEAT EXCHANGER on the Lennox EL296V Elite Series 96% AFUE Two-Stage Variable Speed Gas Furnace means: Cracked Heat Exchanger. The top-ranked community fix is “Replace the Cracked Heat Exchanger Assembly” (hard difficulty, ~240 min, DIY cost: $1200-$1800). 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.

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: $2000-$3000.

Other Lennox Models with Error CRACKED HEAT EXCHANGER

ML196E Merit Series 96% AFUE Single-Stage Gas Furnace

furnace · 2 fixes

SL280V Dave Lennox Signature Collection 80% AFUE Variable Speed Gas Furnace

furnace · 2 fixes

SL297NV Dave Lennox Signature Collection 97% AFUE Modulating Variable Speed Gas Furnace

furnace · 2 fixes

Other Lennox EL296V Elite Series 96% AFUE Two-Stage Variable Speed Gas Furnace Error Codes

1 FLASH

No Previous Fault Code Stored

2 fixes

10 FLASHES

Blower Motor Calibration Fault

2 fixes

11 FLASHES

Auxiliary Limit Switch Open

Inducer Motor Fault

Communicating System Fault

2 fixes

2 FLASHES

System Lockout — Retries Exhausted

2 fixes

3 FLASHES

Pressure Switch Stuck Closed

2 fixes

4 FLASHES

Pressure Switch Open — Did Not Close

2 fixes

People Also Ask About Lennox EL296V Elite Series 96% AFUE Two-Stage Variable Speed Gas Furnace Error CRACKED HEAT EXCHANGER

What does error code CRACKED HEAT EXCHANGER mean on a Lennox EL296V Elite Series 96% AFUE Two-Stage Variable Speed Gas Furnace?

Error code CRACKED HEAT EXCHANGER on the Lennox EL296V Elite Series 96% AFUE Two-Stage Variable Speed Gas Furnace means: Cracked Heat Exchanger. The heat exchanger has developed a crack or hole, allowing combustion gases including carbon monoxide to mix with household air. Most serious furnace safety issue. Symptoms: flame rollout switch tripping, visible flame disturbance when blower starts, CO detector alarms, sooty residue around burners. Lennox furnaces carry a 20-year limited heat exchanger warranty. Requires immediate shutdown and replacement.

How do I fix error code CRACKED HEAT EXCHANGER on my Lennox EL296V Elite Series 96% AFUE Two-Stage Variable Speed Gas Furnace?

The most successful fix is "Replace the Cracked Heat Exchanger Assembly" (hard difficulty, ~240 minutes). Estimated DIY cost: $1200-$1800. HomeMD has 2 community-ranked fixes for this error.

Is error code CRACKED HEAT EXCHANGER on a Lennox EL296V Elite Series 96% AFUE Two-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 Lennox EL296V Elite Series 96% AFUE Two-Stage Variable Speed Gas Furnace error CRACKED HEAT EXCHANGER myself?

Yes — the top-ranked community fix ("Replace the Cracked Heat Exchanger Assembly") is rated hard difficulty and takes about 240 minutes. Tools needed: Adjustable wrench, T20 Torx screwdriver, Multimeter, Gas leak detector, Pipe sealant.

How much does it cost to repair Lennox EL296V Elite Series 96% AFUE Two-Stage Variable Speed Gas Furnace error CRACKED HEAT EXCHANGER?

DIY cost: $1200-$1800. Professional repair typically costs $2000-$3000. Many homeowners save money by trying the top-ranked community fix first.

What other error codes does the Lennox EL296V Elite Series 96% AFUE Two-Stage Variable Speed Gas Furnace have?

The Lennox EL296V Elite Series 96% AFUE Two-Stage Variable Speed Gas Furnace has 8 other known error codes, including: 1 FLASH (No Previous Fault Code Stored), 10 FLASHES (Blower Motor Calibration Fault), 11 FLASHES (Auxiliary Limit Switch Open), 12 FLASHES (Inducer Motor Fault), 13 FLASHES (Communicating System Fault), and 3 more.

Which other Lennox models have the CRACKED HEAT EXCHANGER error?

Error code CRACKED HEAT EXCHANGER also appears on 3 other Lennox models: ML196E Merit Series 96% AFUE Single-Stage Gas Furnace, SL280V Dave Lennox Signature Collection 80% AFUE Variable Speed Gas Furnace, SL297NV Dave Lennox Signature Collection 97% AFUE Modulating Variable Speed Gas Furnace. The fix may vary by model, so check each model's specific page for tailored repair steps.

What other error codes does the Lennox EL296V Elite Series 96% AFUE Two-Stage Variable Speed Gas Furnace have?

The Lennox EL296V Elite Series 96% AFUE Two-Stage Variable Speed Gas Furnace has 8 other known error codes:

1 FLASH — No Previous Fault Code Stored (2 fixes)
10 FLASHES — Blower Motor Calibration Fault (2 fixes)
11 FLASHES — Auxiliary Limit Switch Open (2 fixes)
12 FLASHES — Inducer Motor Fault (2 fixes)
13 FLASHES — Communicating System Fault (2 fixes)
2 FLASHES — System Lockout — Retries Exhausted (2 fixes)
3 FLASHES — Pressure Switch Stuck Closed (2 fixes)
4 FLASHES — Pressure Switch Open — Did Not Close (2 fixes)

Which other Lennox models have the CRACKED HEAT EXCHANGER error?

Error code CRACKED HEAT EXCHANGER also appears on 3 other Lennox models:

ML196E Merit Series 96% AFUE Single-Stage Gas Furnace (furnace) · 2 fixes
SL280V Dave Lennox Signature Collection 80% AFUE Variable Speed Gas Furnace (furnace) · 2 fixes
SL297NV Dave Lennox Signature Collection 97% AFUE Modulating Variable Speed Gas Furnace (furnace) · 2 fixes

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