Outside AC Unit Running but No Air Blowing Inside? Check the Indoor Side First
Outside AC unit running but no air blowing inside? Check the thermostat fan, filter, frozen coil, indoor blower, power, and duct airflow.
Read guide →Latest HVAC Troubleshooting Guides
Choose the symptom that best matches what you're seeing.
Thermostat Not Working? Find the Real Cause Step by Step
Thermostat not working? Diagnose a blank screen, HVAC that won't start, wrong temperature readings, and power loss before replacing the thermostat.
Read guide →
Furnace Blowing Cold Air When Heat Is On? Find the Real Cause
Furnace blowing cold air when the heat is on? Check thermostat settings, airflow, burners, flame sensor, limit switch, and condensate problems.
Read guide →
Furnace Not Turning On but Thermostat Is Working? Check These Causes First
Furnace not turning on even though the thermostat is working? Check power, breaker, filter, ignition sequence, airflow, and safety issues before replacing parts.
Read guide →