← Back to Troubleshooting Wiki
DIY Troubleshooting Guide
How to Fix a Frozen AC Unit
What to do when thick ice builds up on your indoor AC coil or copper lines.
DifficultyModerate
Est. Time⏱️ 2-4 hours
1
1Step
Shut Off the AC Immediately
Switch the thermostat cooling to OFF. Switch the Fan setting to ON to blow ambient air across the coil and accelerate thawing.
Context / Why
Running a frozen AC can damage the compressor beyond repair.
2
2Step
Check for Airflow Obstructions
Replace a dirty filter, and ensure all supply registers and return vents are open and not blocked by furniture.
Context / Why
A lack of warm airflow across the evaporator coil is the most common cause of coils freezing up.
3
3Step
Wait for Full Thawing
Do not attempt to chip the ice away manually as you may pierce the copper refrigerant tubing.
Context / Why
It can take several hours for the block of ice to melt naturally. Forcing it can cause an expensive refrigerant leak.
Still experiencing issues?
If you completed the DIY steps and your system is still not functioning properly, it may require a professional diagnosis.
Dispatch a Licensed HVAC TechLatest Insights
From Our Blog
Don't wait for it to break.
Same-day service, honest pricing, owner-led LA HVAC.