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PILOT LIGHT ISSUES

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

Lennox SL297NV Dave Lennox Signature Collection 97% AFUE Modulating Variable Speed Gas Furnace PILOT LIGHT ISSUES Error Fix: Thermocouple / Pilot Light Issues (Older Units)

Applies to older standing-pilot Lennox furnaces only (pre-2010 models with continuously burning pilot light). The thermocouple has weakened or failed, causing pilot to go out. Safety shutoff if thermocouple doesn't generate ≥20 millivolts. Not applicable to current models (EL296V, SL280V, SL297NV, ML196E) which use electronic hot surface ignition. Included for reference for older units still in service.

Medium severity2 fixes available✨ Free fix available

Quick Answer

Error PILOT LIGHT ISSUES on the Lennox SL297NV Dave Lennox Signature Collection 97% AFUE Modulating Variable Speed Gas Furnace means: Thermocouple / Pilot Light Issues (Older Units). The top-ranked community fix is “Replace the Thermocouple on Older Lennox Furnace” (medium difficulty, ~45 min, DIY cost: $10-$20). 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: $100-$160.

Other Lennox Models with Error PILOT LIGHT ISSUES

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

furnace · 2 fixes

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

Other Lennox SL297NV Dave Lennox Signature Collection 97% AFUE Modulating 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 SL297NV Dave Lennox Signature Collection 97% AFUE Modulating Variable Speed Gas Furnace Error PILOT LIGHT ISSUES

What does error code PILOT LIGHT ISSUES mean on a Lennox SL297NV Dave Lennox Signature Collection 97% AFUE Modulating Variable Speed Gas Furnace?

Error code PILOT LIGHT ISSUES on the Lennox SL297NV Dave Lennox Signature Collection 97% AFUE Modulating Variable Speed Gas Furnace means: Thermocouple / Pilot Light Issues (Older Units). Applies to older standing-pilot Lennox furnaces only (pre-2010 models with continuously burning pilot light). The thermocouple has weakened or failed, causing pilot to go out. Safety shutoff if thermocouple doesn't generate ≥20 millivolts. Not applicable to current models (EL296V, SL280V, SL297NV, ML196E) which use electronic hot surface ignition. Included for reference for older units still in service.

How do I fix error code PILOT LIGHT ISSUES on my Lennox SL297NV Dave Lennox Signature Collection 97% AFUE Modulating Variable Speed Gas Furnace?

The most successful fix is "Replace the Thermocouple on Older Lennox Furnace" (medium difficulty, ~45 minutes). Estimated DIY cost: $10-$20. HomeMD has 2 community-ranked fixes for this error.

Is error code PILOT LIGHT ISSUES on a Lennox SL297NV Dave Lennox Signature Collection 97% AFUE Modulating Variable Speed Gas Furnace serious?

This error is rated medium severity. It should be addressed soon, but your appliance may still function in a limited capacity.

Can I fix Lennox SL297NV Dave Lennox Signature Collection 97% AFUE Modulating Variable Speed Gas Furnace error PILOT LIGHT ISSUES myself?

Yes — the top-ranked community fix ("Replace the Thermocouple on Older Lennox Furnace") is rated medium difficulty and takes about 45 minutes. Tools needed: Adjustable wrench, Needle-nose pliers, Flashlight.

How much does it cost to repair Lennox SL297NV Dave Lennox Signature Collection 97% AFUE Modulating Variable Speed Gas Furnace error PILOT LIGHT ISSUES?

DIY cost: $10-$20. Professional repair typically costs $100-$160. Many homeowners save money by trying the top-ranked community fix first.

What other error codes does the Lennox SL297NV Dave Lennox Signature Collection 97% AFUE Modulating Variable Speed Gas Furnace have?

The Lennox SL297NV Dave Lennox Signature Collection 97% AFUE Modulating 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 PILOT LIGHT ISSUES error?

Error code PILOT LIGHT ISSUES also appears on 3 other Lennox models: EL296V Elite Series 96% AFUE Two-Stage Variable Speed Gas Furnace, ML196E Merit Series 96% AFUE Single-Stage Gas Furnace, SL280V Dave Lennox Signature Collection 80% AFUE 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 SL297NV Dave Lennox Signature Collection 97% AFUE Modulating Variable Speed Gas Furnace have?

The Lennox SL297NV Dave Lennox Signature Collection 97% AFUE Modulating 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 PILOT LIGHT ISSUES error?

Error code PILOT LIGHT ISSUES also appears on 3 other Lennox models:

EL296V Elite Series 96% AFUE Two-Stage Variable Speed Gas Furnace (furnace) · 2 fixes
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

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