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CONTINUOUS ON

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

Lennox SL280V Dave Lennox Signature Collection 80% AFUE Variable Speed Gas Furnace CONTINUOUS ON Error Fix: Control Board Failure

The LED is lit continuously and never flashes OFF. This indicates an internal failure on the IFC control board — the microprocessor or diagnostic circuit has failed. The control board must be replaced. Do NOT confuse with STEADY ON (normal standby). CONTINUOUS ON means the LED never turns off or cycles even during a call for heat.

critical2 fixes available✨ Free fix available

Quick Answer

Error CONTINUOUS ON on the Lennox SL280V Dave Lennox Signature Collection 80% AFUE Variable Speed Gas Furnace means: Control Board Failure. The top-ranked community fix is “Replace the IFC Control Board” (medium difficulty, ~60 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: $300-$450.

Other Lennox Models with Error CONTINUOUS ON

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

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

furnace · 2 fixes

Other Lennox SL280V Dave Lennox Signature Collection 80% AFUE 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 SL280V Dave Lennox Signature Collection 80% AFUE Variable Speed Gas Furnace Error CONTINUOUS ON

What does error code CONTINUOUS ON mean on a Lennox SL280V Dave Lennox Signature Collection 80% AFUE Variable Speed Gas Furnace?

Error code CONTINUOUS ON on the Lennox SL280V Dave Lennox Signature Collection 80% AFUE Variable Speed Gas Furnace means: Control Board Failure. The LED is lit continuously and never flashes OFF. This indicates an internal failure on the IFC control board — the microprocessor or diagnostic circuit has failed. The control board must be replaced. Do NOT confuse with STEADY ON (normal standby). CONTINUOUS ON means the LED never turns off or cycles even during a call for heat.

How do I fix error code CONTINUOUS ON on my Lennox SL280V Dave Lennox Signature Collection 80% AFUE Variable Speed Gas Furnace?

The most successful fix is "Replace the IFC Control Board" (medium difficulty, ~60 minutes). This fix costs nothing. HomeMD has 2 community-ranked fixes for this error.

Is error code CONTINUOUS ON on a Lennox SL280V Dave Lennox Signature Collection 80% AFUE 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 SL280V Dave Lennox Signature Collection 80% AFUE Variable Speed Gas Furnace error CONTINUOUS ON myself?

Yes — the top-ranked community fix ("Replace the IFC Control Board") is rated medium difficulty and takes about 60 minutes. Tools needed: T20 Torx screwdriver, Multimeter, Labeling tape or marker.

How much does it cost to repair Lennox SL280V Dave Lennox Signature Collection 80% AFUE Variable Speed Gas Furnace error CONTINUOUS ON?

DIY cost: $0. Professional repair typically costs $300-$450. Many homeowners save money by trying the top-ranked community fix first.

What other error codes does the Lennox SL280V Dave Lennox Signature Collection 80% AFUE Variable Speed Gas Furnace have?

The Lennox SL280V Dave Lennox Signature Collection 80% AFUE 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 CONTINUOUS ON error?

Error code CONTINUOUS ON 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, 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 SL280V Dave Lennox Signature Collection 80% AFUE Variable Speed Gas Furnace have?

The Lennox SL280V Dave Lennox Signature Collection 80% AFUE 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 CONTINUOUS ON error?

Error code CONTINUOUS ON 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
SL297NV Dave Lennox Signature Collection 97% AFUE Modulating Variable Speed Gas Furnace (furnace) · 2 fixes

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