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1 FLASH

Lennox · ML196E Merit Series 96% AFUE Single-Stage Gas Furnace

Lennox ML196E Merit Series 96% AFUE Single-Stage Gas Furnace 1 FLASH Error Fix: No Previous Fault Code Stored

The LED flashes once, then pauses. This indicates normal operation with no stored fault history. The last call for heat completed successfully. This is a healthy status.

Low severity2 fixes available✨ Free fix available

Quick Answer

Error 1 FLASH on the Lennox ML196E Merit Series 96% AFUE Single-Stage Gas Furnace means: No Previous Fault Code Stored. The top-ranked community fix is “Confirm Normal Operation by Observing LED Status” (easy difficulty, ~10 min, DIY cost: $0). 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: $80-$120.

Other Lennox Models with Error 1 FLASH

EL296V Elite Series 96% AFUE Two-Stage Variable Speed 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 ML196E Merit Series 96% AFUE Single-Stage Gas Furnace Error Codes

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

5 FLASHES

Flame Sensed Without Call for Heat

2 fixes

People Also Ask About Lennox ML196E Merit Series 96% AFUE Single-Stage Gas Furnace Error 1 FLASH

What does error code 1 FLASH mean on a Lennox ML196E Merit Series 96% AFUE Single-Stage Gas Furnace?

Error code 1 FLASH on the Lennox ML196E Merit Series 96% AFUE Single-Stage Gas Furnace means: No Previous Fault Code Stored. The LED flashes once, then pauses. This indicates normal operation with no stored fault history. The last call for heat completed successfully. This is a healthy status.

How do I fix error code 1 FLASH on my Lennox ML196E Merit Series 96% AFUE Single-Stage Gas Furnace?

The most successful fix is "Confirm Normal Operation by Observing LED Status" (easy difficulty, ~10 minutes). This fix costs nothing. HomeMD has 2 community-ranked fixes for this error.

Is error code 1 FLASH on a Lennox ML196E Merit Series 96% AFUE Single-Stage Gas Furnace serious?

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

Can I fix Lennox ML196E Merit Series 96% AFUE Single-Stage Gas Furnace error 1 FLASH myself?

Yes — the top-ranked community fix ("Confirm Normal Operation by Observing LED Status") is rated easy difficulty and takes about 10 minutes. Tools needed: Flashlight.

How much does it cost to repair Lennox ML196E Merit Series 96% AFUE Single-Stage Gas Furnace error 1 FLASH?

DIY cost: $0. Professional repair typically costs $80-$120. Many homeowners save money by trying the top-ranked community fix first.

What other error codes does the Lennox ML196E Merit Series 96% AFUE Single-Stage Gas Furnace have?

The Lennox ML196E Merit Series 96% AFUE Single-Stage Gas Furnace has 8 other known error codes, including: 10 FLASHES (Blower Motor Calibration Fault), 11 FLASHES (Auxiliary Limit Switch Open), 12 FLASHES (Inducer Motor Fault), 13 FLASHES (Communicating System Fault), 2 FLASHES (System Lockout — Retries Exhausted), and 3 more.

Which other Lennox models have the 1 FLASH error?

Error code 1 FLASH also appears on 3 other Lennox models: EL296V Elite Series 96% AFUE Two-Stage Variable Speed 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 ML196E Merit Series 96% AFUE Single-Stage Gas Furnace have?

The Lennox ML196E Merit Series 96% AFUE Single-Stage Gas Furnace has 8 other known error codes:

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)
5 FLASHES — Flame Sensed Without Call for Heat (2 fixes)

Which other Lennox models have the 1 FLASH error?

Error code 1 FLASH also appears on 3 other Lennox models:

EL296V Elite Series 96% AFUE Two-Stage Variable Speed 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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