Troubleshooting Your System

I Have No Cooling

DID YOU CHANGE YOUR FILTER?

Your filter should be changed every 2 months if it's a 1 inch filter or every 6 months for a 5 inch filter. You may not be getting the air flow the system needs to cool your house.


  1. You may have a tripped circuit breaker. Check your home circuit breaker box and reset circuit breaker.
  2. Your thermostat/control may be off or set incorrectly. Check to make sure your thermostat/control is on and set to cool. Reset to your desired temperature.
  3. Your indoor unit is running but the outdoor unit is not.
  4. Air coming through your vent will be warm. Check temperature setting on thermostat/control. If no change,
  5. call Dayco, your comfort specialist. In the meantime, try turning off your thermostat/control for 1 to 3 hours to see if it will reset itself.

I Have No Heat


  1. Your gas could be turned off. Check gas valve at gas company meter, check shutoff valve at furnace and check for other shutoff valves. Contact the gas company to have gas valve turned on or call us immediately.
  2. Your system could be turned off or your unit unplugged.Check your thermostat and heating unit to assure that they are both plugged in. Refer to your use and care guide or call us immediately day or night.
  3. Your thermostat may be off or set incorrectly. Make sure your thermostat is on and set to heat. If thermostat is on, reset thermostat to your desired temperature.
  4. You may have a tripped circuit breaker. Check your home circuit breaker box and reset circuit breaker.

I Have No Airflow


  1. You may have dirty filters. Check the filters in each of your system’s components. Clean or replace filters as recommended in your use and care guide. If problem persists, please contact us or call us.
  2. Your system may have frozen up due to a dirty coil. Check
  3. for signs of water below unit and cold exterior surface of indoor coil enclosure. Try turning your thermostat off for 1-3 hours to see if it will defrost.
  4. My utility bill is unusually high. If your system is reaching its set point, is it working correctly?
  5. Have your local temperatures been extreme lately? Check to see if your system cycling constantly and your thermostat reaching its set temperature Do you have any new appliances (e.g., a hot tub or pool heater) that use lots of power? Have you checked to see if your local utility company had a recent rate increase? If your system is not reaching its set point, please call us or email us.

My System is Constantly Running


  1. Your system could be trying to reach a set point that is too extreme. Check the set point on your thermostat. First, reset your thermostat.
  2. My drain pan is overflowing. The overflow switch is probably not working. Turn off your system and call us.
  3. My system is malfunctioning. Check any of the above troubleshooting issues for help.

If none of the troubleshooting answers address your problem, then turn off your system and contact our 24 hour emergency hotline at 509.586.9464.