🌡️Heat Pump

FROZEN EVAPORATOR

Lennox · XP21 Dave Lennox Signature Collection 20 SEER Heat Pump

Lennox XP21 Dave Lennox Signature Collection 20 SEER Heat Pump FROZEN EVAPORATOR Error Fix: Frozen Evaporator Coil

The indoor evaporator coil has frozen solid, blocking airflow. Causes in order of likelihood: dirty air filter, low refrigerant, slow blower motor, disconnected duct, running AC below 60°F outdoor temp. Turn system OFF, set to FAN ONLY, wait 2–4 hours. Do NOT chip ice off — can puncture copper tubing.

Medium severity2 fixes available

Quick Answer

Error FROZEN EVAPORATOR on the Lennox XP21 Dave Lennox Signature Collection 20 SEER Heat Pump means: Frozen Evaporator Coil. The top-ranked community fix is “Check Refrigerant Charge and Repair Leak” (hard difficulty, ~120 min, DIY cost: $0-$20). 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: $300-$600.

Other Lennox Models with Error FROZEN EVAPORATOR

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

XP25 Dave Lennox Signature Collection Variable-Capacity Heat Pump

heat_pump · 2 fixes

Other Lennox XP21 Dave Lennox Signature Collection 20 SEER 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

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 XP21 Dave Lennox Signature Collection 20 SEER Heat Pump Error FROZEN EVAPORATOR

What does error code FROZEN EVAPORATOR mean on a Lennox XP21 Dave Lennox Signature Collection 20 SEER Heat Pump?

Error code FROZEN EVAPORATOR on the Lennox XP21 Dave Lennox Signature Collection 20 SEER Heat Pump means: Frozen Evaporator Coil. The indoor evaporator coil has frozen solid, blocking airflow. Causes in order of likelihood: dirty air filter, low refrigerant, slow blower motor, disconnected duct, running AC below 60°F outdoor temp. Turn system OFF, set to FAN ONLY, wait 2–4 hours. Do NOT chip ice off — can puncture copper tubing.

How do I fix error code FROZEN EVAPORATOR on my Lennox XP21 Dave Lennox Signature Collection 20 SEER Heat Pump?

The most successful fix is "Check Refrigerant Charge and Repair Leak" (hard difficulty, ~120 minutes). Estimated DIY cost: $0-$20. HomeMD has 2 community-ranked fixes for this error.

Is error code FROZEN EVAPORATOR on a Lennox XP21 Dave Lennox Signature Collection 20 SEER Heat Pump serious?

This error is rated medium severity. It should be addressed soon, but your appliance may still function in a limited capacity.

Can I fix Lennox XP21 Dave Lennox Signature Collection 20 SEER Heat Pump error FROZEN EVAPORATOR myself?

Yes — the top-ranked community fix ("Check Refrigerant Charge and Repair Leak") is rated hard difficulty and takes about 120 minutes. Tools needed: HVAC manifold gauge set, Vacuum pump, Refrigerant leak detector, Brazing torch, Multimeter.

How much does it cost to repair Lennox XP21 Dave Lennox Signature Collection 20 SEER Heat Pump error FROZEN EVAPORATOR?

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 XP21 Dave Lennox Signature Collection 20 SEER Heat Pump have?

The Lennox XP21 Dave Lennox Signature Collection 20 SEER 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), 4 FLASHES YELLOW (Short-Cycle Protection), ALERT 1 (Communication Loss — Outdoor Unit), and 3 more.

Which other Lennox models have the FROZEN EVAPORATOR error?

Error code FROZEN EVAPORATOR 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, 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 XP21 Dave Lennox Signature Collection 20 SEER Heat Pump have?

The Lennox XP21 Dave Lennox Signature Collection 20 SEER 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)
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 FROZEN EVAPORATOR error?

Error code FROZEN EVAPORATOR 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
XP25 Dave Lennox Signature Collection Variable-Capacity Heat Pump (heat pump) · 2 fixes

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