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AC Frozen Coil or Ice on Line

Ice on an AC coil almost always means restricted airflow or low refrigerant. Turn the system off to thaw, replace the filter, and call a pro if ice returns — refrigerant work requires licensed service.

Reviewed July 2026

What does ac frozen coil or ice on line mean?

When airflow drops or refrigerant charge is low, the evaporator coil temperature falls below freezing and moisture forms ice. Running the system while frozen can damage the compressor. Thaw completely before restarting.

What usually causes ac frozen coil or ice on line?

Clogged air filtermost common

Typical repair: $20–$75

Blocked return ventscommon

Typical repair: $20–$75

Low refrigerant chargecommon

Typical repair: $2,500–$5,500

Find your exact error code

Select your furnace brand to jump to the code page for this symptom.

Carrier13Limit or rollout circuit lockoutBryant13Limit or rollout circuit lockoutPayne13Limit or rollout circuit lockoutTempstar4 FlashLimit or rollout circuit openLuxaire3 BlinksPressure-switch circuit did not closeRheem13Flame was lost during operation

What should I check first when ac frozen coil or ice on line?

  1. Turn the AC off at the thermostat and let ice melt completely.
  2. Replace the air filter.
  3. Open all return and supply vents.
  4. Do not run the system until the coil is fully thawed.

What a repair costs

A furnace filter replacement typically costs between $20 and $75 nationally.

Typical repair cost
$20 – $75furnace filter replacement
Where the money goes
Part $10–$50Labor $0–$65Typical labor time: 0.25 hrs

This is general information, not professional advice. Gas, electrical, and combustion repairs can be dangerous — when in doubt, call a licensed technician.