Frozen AC Coils
PriorityIce formation on evaporator coil or refrigerant lines preventing proper cooling.
Frozen coils prevent cooling and can damage compressors. Ice forms when refrigerant temperature drops below normal due to insufficient airflow or low refrigerant charge. Turn off the system to let ice melt before attempting diagnosis. The most common cause is dirty filters, which is easy to fix. Refrigerant issues require professional service.
Symptoms to Look For
Possible Causes
What You Can Check
Before calling for service, try these safe checks that may resolve simple issues:
When to Call a Professional
If freezing recurs after filter replacement and defrosting, refrigerant levels or other issues need professional diagnosis. Running a frozen system risks compressor damage.
Need HVAC service?
Call (650) 540-7205 or book online.
Prevention Tips
Frequently Asked Questions
What should I do if I see ice on my AC?
Turn off the AC but leave the fan running to help melt ice. Check and replace the filter. Once defrosted, try running again. If ice returns, call for service.
Can I chip away the ice to fix the problem?
No. Forcing ice off can damage coils and fins. Let it melt naturally with the system off. Running a frozen system risks compressor damage from liquid refrigerant.
Why does low refrigerant cause freezing?
Low refrigerant reduces pressure, which lowers the evaporation temperature. The coil gets colder than designed, causing moisture in the air to freeze on it rather than drain away.
Browse Other Issues
Ready to Get Started?
Contact us today for expert HVAC service throughout the Bay Area.