Thermostat Problems:

"Below is a list of possible causes and things to check.

Symptom
Check
Click on underlined items for further information
Heater or A/C won't turn on
  • Check for a blown fuse or tripped circuit breaker
  • Make sure thermostat is actually set to "heat" or "cool"
  • Replace the battery in the thermostat
  • If one will turn on but not the other, problem with that equipment
Fan runs constantly
  • Fan switch is set to "On"
  • Digital t-stat needs to be reset by pushing "reset" button
Thermostat doesn't come on at the right temperature
  • Mechanical thermostats need to be level to operate correctly, make sure it is level
  • Double check that it is programmed correctly
  • Replace the battery
Thermostat won't retain programmed settings
  • Replace the battery or T-stat is bad
Thermostat "Aux" light stays on
  • On Heat Pumps;
  • Unit could be in defrost. Wait between 30 - 60 minutes
  • Temperature outside below 20 degrees. Heat Pump can't keep up
  • Outdoor Heat Pump not running. Call for service
  • Low on freon. Call for service.
  • Heat Pump under sized.