Troubleshooting Your Air Conditioner Before Calling a HVAC Technician
Updated: Aug 4
If your air conditioner isn’t working properly, try these steps before calling a technician. These troubleshooting tips might help you fix the problem quickly and get your home cool again right away!
Step 1: Check the Thermostat
1. Ensure the thermostat is set to “cool”:
• Make sure it is set to a temperature lower than the current room temperature.
2. Check the power source:
• Replace the batteries if the thermostat is battery-powered.
• Confirm the thermostat is properly connected to its power source.
Step 2: Inspect the Air Filters
1. Locate the air filter:
• This is usually near the return air duct or the air handler.
2. Check for dirt and debris:
• If the filter is dirty or clogged, replace it with a new one.
• Filters should typically be replaced every 1-3 months.
Step 3: Examine the Circuit Breaker
1. Find your electrical panel:
• This is often in the basement, garage, or utility room.
2. Check for tripped breakers:
• If the breaker for the air conditioner has tripped, reset it by flipping it off and then back on.
Step 4: Ensure the Outdoor Unit is Clean
1. Locate the outdoor unit:
• This is the condenser unit outside your home.
2. Clear away debris:
• Remove any leaves, dirt, or other debris around the unit.
• Ensure there is at least 2 feet of clearance around the unit for proper airflow.
3. Clean the coils:
• Turn off the power to the unit.
• Use a garden hose to gently rinse the coils. Do not use high pressure.
Step 5: Check for Obstructions
1. Inspect the vents:
• Ensure all supply and return vents inside your home are open and unobstructed.
• Remove any furniture or objects blocking the vents.
Step 6: Verify the Drain Line
1. Locate the condensate drain line:
• This is usually a PVC pipe near the indoor air handler.
2. Check for clogs:
• If the line is clogged, use a wet/dry vacuum to remove the blockage.
• Pour a mixture of water and vinegar through the line to help clear any buildup.
Step 7: Assess the Refrigerant Lines
1. Inspect the refrigerant lines:
• These are the copper pipes running from the outdoor unit to the indoor unit.
2. Check for ice or frost:
• If you notice ice on the lines, turn off the unit and let it thaw. This could indicate a refrigerant leak or other issue requiring professional attention.
Step 8: Listen for Unusual Noises
1. Turn on the air conditioner:
• Listen for any unusual sounds such as grinding, squealing, or rattling.
2. Identify the source:
• If you hear strange noises, this might indicate a mechanical issue that needs a professional inspection.
If none of these steps resolve the issue, it’s time to call a professional HVAC technician. Be sure to provide them with details of the steps you’ve already taken, which can help speed up the diagnosis and repair process.
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