❄️Air Conditioner

SOLID GREEN

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

Lennox XC25 Dave Lennox Signature Collection 26 SEER Variable-Capacity Air Conditioner SOLID GREEN Error Fix: Normal — Standby

The outdoor unit control board has power and is operating normally, waiting for a call from the thermostat.

Low severity2 fixes available✨ Free fix available

Quick Answer

Error SOLID GREEN on the Lennox XC25 Dave Lennox Signature Collection 26 SEER Variable-Capacity Air Conditioner means: Normal — Standby. The top-ranked community fix is “Test Control Board and Thermostat Communication” (medium difficulty, ~30 min, DIY cost: $0). 2 community-ranked fixes available below.

Published February 2026 · 2 fixes · air conditioner

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 air conditioner 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 SOLID GREEN

CBX27UH Lennox Variable Speed Air Handler

air_handler · 2 fixes

ML14XC1 Merit Series 14 SEER Single-Stage Air Conditioner

air_conditioner · 2 fixes

XC21 Dave Lennox Signature Collection 21 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 XC25 Dave Lennox Signature Collection 26 SEER Variable-Capacity Air Conditioner Error Codes

1 FLASH YELLOW

High Pressure Switch Open

2 fixes

2 FLASHES YELLOW

Low Pressure Switch Open

2 fixes

3 FLASHES YELLOW

Compressor Thermal Overload

2 fixes

4 FLASHES YELLOW

Short-Cycle Protection

2 fixes

ALERT 1

Communication Loss — Outdoor Unit

2 fixes

ALERT 11

High Pressure Protection — Outdoor Unit

2 fixes

ALERT 12

Low Pressure Protection — Outdoor Unit

2 fixes

ALERT 14

Compressor Discharge Temperature High

2 fixes

People Also Ask About Lennox XC25 Dave Lennox Signature Collection 26 SEER Variable-Capacity Air Conditioner Error SOLID GREEN

What does error code SOLID GREEN mean on a Lennox XC25 Dave Lennox Signature Collection 26 SEER Variable-Capacity Air Conditioner?

Error code SOLID GREEN on the Lennox XC25 Dave Lennox Signature Collection 26 SEER Variable-Capacity Air Conditioner means: Normal — Standby. The outdoor unit control board has power and is operating normally, waiting for a call from the thermostat.

How do I fix error code SOLID GREEN on my Lennox XC25 Dave Lennox Signature Collection 26 SEER Variable-Capacity Air Conditioner?

The most successful fix is "Test Control Board and Thermostat Communication" (medium difficulty, ~30 minutes). This fix costs nothing. HomeMD has 2 community-ranked fixes for this error.

Is error code SOLID GREEN on a Lennox XC25 Dave Lennox Signature Collection 26 SEER Variable-Capacity Air Conditioner 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 XC25 Dave Lennox Signature Collection 26 SEER Variable-Capacity Air Conditioner error SOLID GREEN myself?

Yes — the top-ranked community fix ("Test Control Board and Thermostat Communication") is rated medium difficulty and takes about 30 minutes. Tools needed: T20 Torx screwdriver, Multimeter.

How much does it cost to repair Lennox XC25 Dave Lennox Signature Collection 26 SEER Variable-Capacity Air Conditioner error SOLID GREEN?

DIY cost: $0. 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 XC25 Dave Lennox Signature Collection 26 SEER Variable-Capacity Air Conditioner have?

The Lennox XC25 Dave Lennox Signature Collection 26 SEER Variable-Capacity Air Conditioner has 8 other known error codes, including: 1 FLASH YELLOW (High Pressure Switch Open), 2 FLASHES YELLOW (Low Pressure Switch Open), 3 FLASHES YELLOW (Compressor Thermal Overload), 4 FLASHES YELLOW (Short-Cycle Protection), ALERT 1 (Communication Loss — Outdoor Unit), and 3 more.

Which other Lennox models have the SOLID GREEN error?

Error code SOLID GREEN also appears on 5 other Lennox models: CBX27UH Lennox Variable Speed Air Handler, ML14XC1 Merit Series 14 SEER Single-Stage Air Conditioner, XC21 Dave Lennox Signature Collection 21 SEER Variable-Capacity Air Conditioner, XP21 Dave Lennox Signature Collection 20 SEER Heat Pump, XP25 Dave Lennox Signature Collection Variable-Capacity Heat Pump. The fix may vary by model, so check each model's specific page for tailored repair steps.

What other error codes does the Lennox XC25 Dave Lennox Signature Collection 26 SEER Variable-Capacity Air Conditioner have?

The Lennox XC25 Dave Lennox Signature Collection 26 SEER Variable-Capacity Air Conditioner has 8 other known error codes:

1 FLASH YELLOW — High Pressure Switch Open (2 fixes)
2 FLASHES YELLOW — Low Pressure Switch Open (2 fixes)
3 FLASHES YELLOW — Compressor Thermal Overload (2 fixes)
4 FLASHES YELLOW — Short-Cycle Protection (2 fixes)
ALERT 1 — Communication Loss — Outdoor Unit (2 fixes)
ALERT 11 — High Pressure Protection — Outdoor Unit (2 fixes)
ALERT 12 — Low Pressure Protection — Outdoor Unit (2 fixes)
ALERT 14 — Compressor Discharge Temperature High (2 fixes)

Which other Lennox models have the SOLID GREEN error?

Error code SOLID GREEN also appears on 5 other Lennox models:

CBX27UH Lennox Variable Speed Air Handler (air handler) · 2 fixes
ML14XC1 Merit Series 14 SEER Single-Stage Air Conditioner (air conditioner) · 2 fixes
XC21 Dave Lennox Signature Collection 21 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

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