❄️Air Conditioner

SOLID RED

Lennox · ML14XC1 Merit Series 14 SEER Single-Stage Air Conditioner

Lennox ML14XC1 Merit Series 14 SEER Single-Stage Air Conditioner SOLID RED Error Fix: Compressor Lockout

The compressor has been locked out after multiple consecutive fault trips. Unit will not restart until power is cycled at outdoor disconnect. Investigate and fix root cause before resetting.

critical2 fixes available✨ Free fix available

Quick Answer

Error SOLID RED on the Lennox ML14XC1 Merit Series 14 SEER Single-Stage Air Conditioner means: Compressor Lockout. The top-ranked community fix is “Diagnose and Repair Compressor Lockout Root Cause” (hard difficulty, ~90 min, DIY cost: $0-$20). 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: $300-$600.

Other Lennox Models with Error SOLID RED

CBX27UH Lennox Variable Speed Air Handler

air_handler · 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 ML14XC1 Merit Series 14 SEER Single-Stage 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

CAPACITOR FAILURE

Capacitor Failure (Run/Start)

Compressor Failure

Condenser Fan Motor Failure

2 fixes

CONTACTOR FAILURE

Contactor Failure

2 fixes

People Also Ask About Lennox ML14XC1 Merit Series 14 SEER Single-Stage Air Conditioner Error SOLID RED

What does error code SOLID RED mean on a Lennox ML14XC1 Merit Series 14 SEER Single-Stage Air Conditioner?

Error code SOLID RED on the Lennox ML14XC1 Merit Series 14 SEER Single-Stage Air Conditioner means: Compressor Lockout. The compressor has been locked out after multiple consecutive fault trips. Unit will not restart until power is cycled at outdoor disconnect. Investigate and fix root cause before resetting.

How do I fix error code SOLID RED on my Lennox ML14XC1 Merit Series 14 SEER Single-Stage Air Conditioner?

The most successful fix is "Diagnose and Repair Compressor Lockout Root Cause" (hard difficulty, ~90 minutes). Estimated DIY cost: $0-$20. HomeMD has 2 community-ranked fixes for this error.

Is error code SOLID RED on a Lennox ML14XC1 Merit Series 14 SEER Single-Stage Air Conditioner 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 ML14XC1 Merit Series 14 SEER Single-Stage Air Conditioner error SOLID RED myself?

Yes — the top-ranked community fix ("Diagnose and Repair Compressor Lockout Root Cause") is rated hard difficulty and takes about 90 minutes. Tools needed: T20 Torx screwdriver, Multimeter, Capacitance meter, Nut driver set.

How much does it cost to repair Lennox ML14XC1 Merit Series 14 SEER Single-Stage Air Conditioner error SOLID RED?

DIY cost: $0-$20. Professional repair typically costs $300-$600. Many homeowners save money by trying the top-ranked community fix first.

What other error codes does the Lennox ML14XC1 Merit Series 14 SEER Single-Stage Air Conditioner have?

The Lennox ML14XC1 Merit Series 14 SEER Single-Stage 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), CAPACITOR FAILURE (Capacitor Failure (Run/Start)), and 3 more.

Which other Lennox models have the SOLID RED error?

Error code SOLID RED also appears on 5 other Lennox models: CBX27UH Lennox Variable Speed Air Handler, XC21 Dave Lennox Signature Collection 21 SEER Variable-Capacity Air Conditioner, XC25 Dave Lennox Signature Collection 26 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 ML14XC1 Merit Series 14 SEER Single-Stage Air Conditioner have?

The Lennox ML14XC1 Merit Series 14 SEER Single-Stage 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)
CAPACITOR FAILURE — Capacitor Failure (Run/Start) (2 fixes)
COMPRESSOR FAILURE — Compressor Failure (2 fixes)
CONDENSER FAN FAIL — Condenser Fan Motor Failure (2 fixes)
CONTACTOR FAILURE — Contactor Failure (2 fixes)

Which other Lennox models have the SOLID RED error?

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

CBX27UH Lennox Variable Speed Air Handler (air handler) · 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

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