🔥Furnace

NO LIGHT

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

Lennox SL280V Dave Lennox Signature Collection 80% AFUE Variable Speed Gas Furnace NO LIGHT Error Fix: No Power to Control Board

The diagnostic LED is completely off. The control board is not receiving 115 VAC power. Check the furnace power switch on or near the furnace, the circuit breaker, and the IFC fuse (3-amp automotive-style fuse on the control board). If the fuse is blown, check for a short in the thermostat wiring or a failed transformer before replacing the fuse.

critical2 fixes available✨ Free fix available

Quick Answer

Error NO LIGHT on the Lennox SL280V Dave Lennox Signature Collection 80% AFUE Variable Speed Gas Furnace means: No Power to Control Board. The top-ranked community fix is “Test and Replace Control Board Transformer or Repair Thermostat Wiring” (hard difficulty, ~60 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: $120-$200.

Other Lennox Models with Error NO LIGHT

CBX27UH Lennox Variable Speed Air Handler

air_handler · 2 fixes

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

furnace · 2 fixes

ML14XC1 Merit Series 14 SEER Single-Stage Air Conditioner

air_conditioner · 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

XC21 Dave Lennox Signature Collection 21 SEER Variable-Capacity Air Conditioner

air_conditioner · 2 fixes

XC25 Dave Lennox Signature Collection 26 SEER Variable-Capacity Air Conditioner

air_conditioner · 2 fixes

XP21 Dave Lennox Signature Collection 20 SEER Heat Pump

heat_pump · 2 fixes

XP25 Dave Lennox Signature Collection Variable-Capacity Heat Pump

heat_pump · 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 NO LIGHT

What does error code NO LIGHT mean on a Lennox SL280V Dave Lennox Signature Collection 80% AFUE Variable Speed Gas Furnace?

Error code NO LIGHT on the Lennox SL280V Dave Lennox Signature Collection 80% AFUE Variable Speed Gas Furnace means: No Power to Control Board. The diagnostic LED is completely off. The control board is not receiving 115 VAC power. Check the furnace power switch on or near the furnace, the circuit breaker, and the IFC fuse (3-amp automotive-style fuse on the control board). If the fuse is blown, check for a short in the thermostat wiring or a failed transformer before replacing the fuse.

How do I fix error code NO LIGHT on my Lennox SL280V Dave Lennox Signature Collection 80% AFUE Variable Speed Gas Furnace?

The most successful fix is "Test and Replace Control Board Transformer or Repair Thermostat Wiring" (hard difficulty, ~60 minutes). Estimated DIY cost: $10-$20. HomeMD has 2 community-ranked fixes for this error.

Is error code NO LIGHT 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 NO LIGHT myself?

Yes — the top-ranked community fix ("Test and Replace Control Board Transformer or Repair Thermostat Wiring") is rated hard difficulty and takes about 60 minutes. Tools needed: T20 Torx screwdriver, Multimeter, Wire strippers, Needle-nose pliers.

How much does it cost to repair Lennox SL280V Dave Lennox Signature Collection 80% AFUE Variable Speed Gas Furnace error NO LIGHT?

DIY cost: $10-$20. Professional repair typically costs $120-$200. 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 NO LIGHT error?

Error code NO LIGHT also appears on 9 other Lennox models: CBX27UH Lennox Variable Speed Air Handler, EL296V Elite Series 96% AFUE Two-Stage Variable Speed Gas Furnace, ML14XC1 Merit Series 14 SEER Single-Stage Air Conditioner, ML196E Merit Series 96% AFUE Single-Stage Gas Furnace, SL297NV Dave Lennox Signature Collection 97% AFUE Modulating Variable Speed Gas Furnace, XC21 Dave Lennox Signature Collection 21 SEER Variable-Capacity Air Conditioner, and 3 more. 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 NO LIGHT error?

Error code NO LIGHT also appears on 9 other Lennox models:

CBX27UH Lennox Variable Speed Air Handler (air handler) · 2 fixes
EL296V Elite Series 96% AFUE Two-Stage Variable Speed Gas Furnace (furnace) · 2 fixes
ML14XC1 Merit Series 14 SEER Single-Stage Air Conditioner (air conditioner) · 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
XC21 Dave Lennox Signature Collection 21 SEER Variable-Capacity Air Conditioner (air conditioner) · 2 fixes
XC25 Dave Lennox Signature Collection 26 SEER Variable-Capacity Air Conditioner (air conditioner) · 2 fixes
XP21 Dave Lennox Signature Collection 20 SEER Heat Pump (heat pump) · 2 fixes
XP25 Dave Lennox Signature Collection Variable-Capacity Heat Pump (heat pump) · 2 fixes

Ad Space — banner

Replace ADSENSE_PUBLISHER_ID in AdUnit.tsx