1. Check the thermostat
Confirm the thermostat is set to Cool, the set point is below the room temperature, and the fan is set to Auto. If the display is blank or the system does not respond, a power or thermostat issue may be involved.
2. Check airflow at the filter and vents
A very dirty filter can restrict airflow and make the system struggle. Check that supply vents are open and that return grilles are not blocked by furniture. Replace a disposable filter only with the correct size and type for the system.
3. Look for ice, water, or unusual sounds
Ice on the indoor coil or refrigerant lines, water around the indoor unit, repeated clicking, or a loud outdoor fan are useful clues for a technician. Turn the system off if ice is building up and avoid scraping it away.
4. Know when to stop troubleshooting
Do not remove electrical panels, disconnect refrigerant lines, or keep running a system that smells burnt or is making a sharp mechanical noise. Those conditions need a professional inspection.
HVAC Doctor can diagnose the system, explain what caused the problem, and provide a firm price before approved repair work begins. The $39 diagnostic is applied to an approved repair.
Need help with the problem?
HVAC Doctor serves Lexington and the listed Central Kentucky cities. You receive a firm quote before approved repair work begins.
Common questions
Why is my AC running but not cooling?
Common causes include airflow restriction, thermostat problems, frozen coils, electrical issues, or equipment failure. A diagnosis identifies the actual cause.
Should I turn off an AC that is frozen?
Yes. Turn the cooling off and leave the fan on only if your system instructions allow it. Do not chip at the ice or handle refrigerant.
How much does an AC diagnostic cost?
HVAC Doctor charges a $39 diagnostic that is applied to an approved repair. A firm quote is provided before work begins.