❄️Air Conditioner

FLASHING GREEN

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

Lennox ML14XC1 Merit Series 14 SEER Single-Stage Air Conditioner FLASHING GREEN Error Fix: Normal — Unit Running

The outdoor unit is operating normally in response to a cooling or heating call from the thermostat. Compressor and condenser fan are running.

Low severity2 fixes available✨ Free fix available

Quick Answer

Error FLASHING GREEN on the Lennox ML14XC1 Merit Series 14 SEER Single-Stage Air Conditioner means: Normal — Unit Running. The top-ranked community fix is “Perform Electrical and Component Diagnostic Check” (medium difficulty, ~45 min, DIY cost: $0-$15). 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-$180.

Other Lennox Models with Error FLASHING GREEN

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 FLASHING GREEN

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

Error code FLASHING GREEN on the Lennox ML14XC1 Merit Series 14 SEER Single-Stage Air Conditioner means: Normal — Unit Running. The outdoor unit is operating normally in response to a cooling or heating call from the thermostat. Compressor and condenser fan are running.

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

The most successful fix is "Perform Electrical and Component Diagnostic Check" (medium difficulty, ~45 minutes). Estimated DIY cost: $0-$15. HomeMD has 2 community-ranked fixes for this error.

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

Yes — the top-ranked community fix ("Perform Electrical and Component Diagnostic Check") is rated medium difficulty and takes about 45 minutes. Tools needed: T20 Torx screwdriver, Multimeter, Protective gloves.

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

DIY cost: $0-$15. Professional repair typically costs $120-$180. 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 FLASHING GREEN error?

Error code FLASHING GREEN 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 FLASHING GREEN error?

Error code FLASHING GREEN 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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