HVAC Troubleshooting Help for Homeowners
Having trouble with your heating or cooling system? Start with our HVAC troubleshooting guides for common problems homeowners experience. Each guide walks you through safe checks you can perform before deciding whether you need additional help from an HVAC professional.
Select the problem that best matches what your heating or cooling system is doing. Each guide includes safe troubleshooting checks and explains when it's time to get professional HVAC help.
HVAC Troubleshooting Help for Common Problems
AC Not Cooling
AC Not Turning On
Is your air conditioner running but your home still isn't getting cool? Check common causes including thermostat settings, airflow, the outdoor unit, and a frozen AC system.
Is your air conditioner completely unresponsive or failing to start? Check the thermostat, breakers, HVAC power, and outdoor unit before deciding what to do next.
Furnace Not Heating
Furnace Blowing Cold Air
Is your furnace not producing heat or failing to start? Check the thermostat, air filter, furnace power, venting, and other common issues before deciding what to do next.
Is your furnace running but blowing cool or cold air from the vents? Check the thermostat, air filter, airflow, furnace operation, and venting for common problems.
Thermostat Not Working
Is your thermostat blank, unresponsive, or not controlling your heating or cooling system properly? Check the settings, batteries, HVAC power, and other common causes.
Still Need HVAC Troubleshooting Help?
If the troubleshooting guides above don't solve the problem, FixWithAPro can help you take the next step. During a live video session, an experienced HVAC technician can review what your system is doing, guide you through additional safe checks, and help determine whether you need an in-person HVAC professional.