If your Carrier thermostat isn't working the way you think it should, it's possible you can try a few methods before you call in a service technician. There could be a problem with your thermostat, with your HVAC unit or with something in your house, but almost all problems you can fix on your own without any special tools. Try Carrier thermostat troubleshooting to save time and money you would otherwise spend with a service technician.
Examine the "System Switch" when you have Carrier thermostat problems. If you want cool air to blow, make sure the thermostat is set to "Cool." If you want warm air to blow, make sure the thermostat is set to "Heat."
Check all of the circuit breakers in your circuit breaker box. Make sure they are all in the "On" position. If one is "Off," flip it "On" and see if that fixes the problem.
Look on your air conditioner outside for a "Disconnect Switch." You'll find the switch in a grey box mounted to the wall near your outdoor unit. Make sure the switch is in the "On" position.
Change the filter in your HVAC filter. A filter that's extremely blocked could cause your HVAC motor to turn off.
Move furniture out of the way of your return air grills, the long flat vents usually located on walls. Blocking these vents could cause your motor to turn off.