🌡️Heat Pump

4 FLASHES YELLOW

Lennox · XP25 Dave Lennox Signature Collection Variable-Capacity Heat Pump

Lennox XP25 Dave Lennox Signature Collection Variable-Capacity Heat Pump 4 FLASHES YELLOW Error Fix: Short-Cycle Protection

The compressor is in its minimum-off-time delay (typically 5 minutes) for pressure equalization before restarting. Normal protective function. If persistent, check for rapid thermostat cycling or electrical intermittent at the contactor.

Low severity2 fixes available✨ Free fix available

Quick Answer

Error 4 FLASHES YELLOW on the Lennox XP25 Dave Lennox Signature Collection Variable-Capacity Heat Pump means: Short-Cycle Protection. The top-ranked community fix is “Inspect and Replace Contactor to Fix Short-Cycle Protection” (medium difficulty, ~45 min, DIY cost: $0). 2 community-ranked fixes available below.

Published February 2026 · 2 fixes · heat pump

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 heat pump 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: $150-$220.

Other Lennox Models with Error 4 FLASHES YELLOW

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

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

Other Lennox XP25 Dave Lennox Signature Collection Variable-Capacity Heat Pump 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

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

ALERT 2

Communication Loss — Indoor Unit

2 fixes

People Also Ask About Lennox XP25 Dave Lennox Signature Collection Variable-Capacity Heat Pump Error 4 FLASHES YELLOW

What does error code 4 FLASHES YELLOW mean on a Lennox XP25 Dave Lennox Signature Collection Variable-Capacity Heat Pump?

Error code 4 FLASHES YELLOW on the Lennox XP25 Dave Lennox Signature Collection Variable-Capacity Heat Pump means: Short-Cycle Protection. The compressor is in its minimum-off-time delay (typically 5 minutes) for pressure equalization before restarting. Normal protective function. If persistent, check for rapid thermostat cycling or electrical intermittent at the contactor.

How do I fix error code 4 FLASHES YELLOW on my Lennox XP25 Dave Lennox Signature Collection Variable-Capacity Heat Pump?

The most successful fix is "Inspect and Replace Contactor to Fix Short-Cycle Protection" (medium difficulty, ~45 minutes). This fix costs nothing. HomeMD has 2 community-ranked fixes for this error.

Is error code 4 FLASHES YELLOW on a Lennox XP25 Dave Lennox Signature Collection Variable-Capacity Heat Pump 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 XP25 Dave Lennox Signature Collection Variable-Capacity Heat Pump error 4 FLASHES YELLOW myself?

Yes — the top-ranked community fix ("Inspect and Replace Contactor to Fix Short-Cycle Protection") is rated medium difficulty and takes about 45 minutes. Tools needed: T20 Torx screwdriver, Multimeter, Needle-nose pliers.

How much does it cost to repair Lennox XP25 Dave Lennox Signature Collection Variable-Capacity Heat Pump error 4 FLASHES YELLOW?

DIY cost: $0. Professional repair typically costs $150-$220. Many homeowners save money by trying the top-ranked community fix first.

What other error codes does the Lennox XP25 Dave Lennox Signature Collection Variable-Capacity Heat Pump have?

The Lennox XP25 Dave Lennox Signature Collection Variable-Capacity Heat Pump 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), ALERT 1 (Communication Loss — Outdoor Unit), ALERT 11 (High Pressure Protection — Outdoor Unit), and 3 more.

Which other Lennox models have the 4 FLASHES YELLOW error?

Error code 4 FLASHES YELLOW also appears on 4 other Lennox models: ML14XC1 Merit Series 14 SEER Single-Stage Air Conditioner, 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. The fix may vary by model, so check each model's specific page for tailored repair steps.

What other error codes does the Lennox XP25 Dave Lennox Signature Collection Variable-Capacity Heat Pump have?

The Lennox XP25 Dave Lennox Signature Collection Variable-Capacity Heat Pump 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)
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)
ALERT 2 — Communication Loss — Indoor Unit (2 fixes)

Which other Lennox models have the 4 FLASHES YELLOW error?

Error code 4 FLASHES YELLOW also appears on 4 other Lennox models:

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
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

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