How to How to Fix AC Freezing Up
A frozen air conditioner can't cool your home and may damage the compressor. Learn the common causes of AC freeze-ups and how to safely thaw and prevent future freezing.
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0 of 6 steps completedStep-by-Step Instructions
1 Step 1: Turn Off AC Immediately
Mike Johnson: "Pro tip: Make sure to double-check this before moving to the next step..."
Step 1: Turn Off AC Immediately
Shut off the air conditioner at the thermostat and circuit breaker. Running a frozen AC can damage the compressor.
2 Step 2: Allow Ice to Thaw
Mike Johnson: "Pro tip: Make sure to double-check this before moving to the next step..."
Step 2: Allow Ice to Thaw
Turn on the fan-only mode to circulate air and speed thawing. Place towels under the unit to catch water. Full thawing takes 1-24 hours.
3 Step 3: Check and Replace Filter
Mike Johnson: "Pro tip: Make sure to double-check this before moving to the next step..."
Step 3: Check and Replace Filter
A dirty filter is the most common cause. Replace with a clean filter and ensure vents aren't blocked by furniture.
4 Step 4: Inspect Indoor Coils
Step 4: Inspect Indoor Coils
Dirty evaporator coils restrict airflow. If accessible, gently clean with a soft brush. Professional cleaning may be needed for thorough cleaning.
5 Step 5: Verify Proper Airflow
Step 5: Verify Proper Airflow
Ensure all supply vents are open and registers aren't blocked. Close no more than 20% of vents to maintain proper system pressure.
6 Step 6: Call HVAC Professional if Problem Persists
Step 6: Call HVAC Professional if Problem Persists
Recurring freezing may indicate low refrigerant, blower motor issues, or refrigerant leak requiring professional diagnosis and repair.