Troubleshoot

HVAC system issues? Here are a few simple troubleshooting tasks to try before calling for a service technician:

Air Conditioning Equipment Checklist

1. Check to make sure that your thermostat is set in the "auto" or "cool" position.
2. Ensure that your outdoor air conditioning (condensing unit) is running:
   • Check the circuit breakers in the circuit breaker box (or electrical panel), most likely mounted to an outside wall in the back of the house. Make sure they are all in the "ON" position.
   • Check the outdoor unit "disconnect switch" to make sure it is in the "ON" position. The disconnect switch is located near the outdoor unit. (Normally a grey 8″ wide x 16″ high x 4″ deep box mounted to the wall).
3. Ensure that the blower motor in your furnace is running. (If the thermostat is in the "cool" position, the furnace blower should be running.)
   • If not, check to make sure the on / off switch at the furnace is in the "ON" position
4. Be sure that you have changed your filter in the furnace recently.
   • An extremely blocked filter can cause your outdoor air conditioner unit to shut down due to lack of proper airflow.
   • Your filter should be changed every 4-6 weeks for a 1-2" filter, or 6 months to a year for a 4-5" wide media filter depending on how often your HVAC system is used.
5. Check all return air grilles to make sure they are not blocked by furniture.
   • Check all supply air registers to make sure they are open and blowing air. (The return air grilles are normally located on your walls and are wide and flat).

** If these troubleshooting items do not help, turn your air conditioner off at the thermostat and contact Design Air immediately. Not turning the AC off could cause further damage to your system**

Gas Furnace Equipment

1. Check to make sure that your thermostat is set in the "heat" position
2. Make sure that the temperature setting on the thermostat is set above (or higher than) the indoor temperature showing on the thermostat.
3. Ensure that there is power to the furnace:
   • Try turning the fan to 'ON' using the fan switch on the thermostat to test for power to furnace.
4. Check the circuit breakers at the electrical panel.
5. Check the SSU switch (it looks like a light switch on a gray box located at the furnace) to be sure it is in the 'ON' position
6. Has the furnace filter been replaced recently?
   • Your filter should be changed every 4-6 weeks for a 1-2" filter, or 6 months to a year for a 4-5" wide media filter depending on how often your HVAC system is used.
7. If the system is running but you have not changed your filter, the filter needs to be replaced.
8. Check all return air grilles to make sure they are not blocked by furniture.
   • Check all supply air registers to make sure they are open and blowing air. (The return air grilles are normally located on your walls and are wide and flat).

If these troubleshooting items do not help, contact Design Air today to schedule a service call.