Troubleshooting
AC Freezing Up (Ice on the Lines or Coil)
Quick answer
Ice means low airflow or low refrigerant. First fix: replace filter, turn off AC, wait 2 hours for ice to thaw. If it freezes again, call us.
Common causes
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Dirty filter
easyMost common. Low airflow → coil temp drops below 32°F → moisture freezes on it.
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Closed registers
easyToo many supply registers closed = same as dirty filter. Open them all.
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Low refrigerant
moderateLess refrigerant = lower coil temp at the same airflow. Find the leak, fix it, recharge.
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Bad blower motor
moderateSlow blower → low airflow → freeze. Check amp draw.
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Dirty indoor coil
moderateCoated with dust → poor heat transfer → freeze. Clean it.
DIY first
- 1 Turn the thermostat to OFF (not COOL) and the fan to ON. The blower-only run melts ice without re-freezing it. 1–3 hours.
- 2 Once thawed, replace the filter.
- 3 Open every supply register fully.
- 4 Run the AC again and watch — if it re-freezes within an hour, call us.
Call us if:
- Re-freezes after thaw + filter change
- Refrigerant line set is icy ALL the way back to the outdoor unit
- Water has leaked from the indoor cabinet onto the floor
Other symptoms in this category
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