Air conditioning · triage
Frozen AC coil or iced refrigerant lines
The short answer
Turn cooling off and run the fan only until the ice is gone (often a few hours). Then fix airflow: filter, vents, returns. If it ices again, a technician needs to check refrigerant and the blower.
Don’t chip the iceScraping or chipping ice can puncture the coil or lines. Let it melt, and put towels down for the meltwater.
Know your shutoffs
Every outcome on this card
This weekThaw it, then fix airflow
You can usually handle the first steps.
- Thermostat to Off, fan to On Wait until all ice is gone; a few hours is common.
- Replace the filter; open every supply vent and clear the returns
- Restart cooling and check for ice after a few hours If ice returns, call a technician.
Restricted airflow makes the coil too cold, and moisture freezes on it.
This weekIcing keeps coming back
Book a technician this week.
- Leave cooling off while it is iced Running a frozen system can damage the compressor.
- Note when it happens (night, hot days, long runs)
- Call an HVAC technician Ask them to check refrigerant charge (a leak), blower speed and the coil.
Repeated icing with clean filters usually means low refrigerant from a leak or a blower problem. Topping up refrigerant without finding the leak only delays it.
Related
Written from
Original casaq guidance, updated 2026-10-05. General guidance, not a diagnosis; licensed-pro review pending. Severity levels: Emergency now / Today / This week / This month / Watch. Send a correction.
Step 1