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Ice Forming on Indoor or Outdoor Unit

Ice or frost visible on evaporator coil, refrigerant lines, or outdoor unit

Fix Steps:
1
Turn system OFF immediately at thermostat - continued operation will damage compressor
2
Turn fan to "ON" position to help thaw ice (not AUTO)
3
Check air filter - dirty filter is most common cause, replace immediately
4
Inspect all supply and return vents for blockages
5
Ensure at least 50% of home's vents are open
6
Check refrigerant lines for excessive ice buildup
7
Let system thaw completely (4-6 hours) before restarting
8
Once thawed, check for proper airflow from vents
9
Monitor thermostat setting - don't set too low (below 68°F can cause freezing)
10
If freezing recurs, likely low refrigerant - call for service
Preventive Tip

Change filter every 30 days. Never close more than 50% of vents. Maintain minimum 68°F setpoint. Schedule professional refrigerant check annually. Keep outdoor unit clean and clear.

References & Further Reading
These resources provide additional technical information and official documentation.
1
Carrier AC Frozen Coil Guide
2
Air Conditioner Freeze-Up Prevention
3
HVAC Refrigerant System Basics
Related FAQs

When airflow is restricted, the evaporator coil gets too cold and moisture in the air freezes on it. This creates a vicious cycle - more ice means even less airflow. Always address the root airflow issue.
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NEVER! You can damage the delicate coil fins and refrigerant lines. Always let it thaw naturally by running the fan only or turning the system off completely.
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Change filters monthly, keep at least 50% of vents open, never set temperature below 68°F, ensure proper insulation, and schedule annual professional maintenance.
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Ice on refrigerant lines indicates low refrigerant (leak) or a metering device problem. This requires professional repair - refrigerant systems are sealed and cannot be DIY fixed.
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Quick Tips
  • Always unplug devices before troubleshooting
  • Take photos before disassembly
  • Keep screws organized
  • Consult manual for error codes
  • Back up data before repairs
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