A Carrier programmable thermostat can work well for many years with the proper care. However, as with many other items, Carrier thermostats can malfunction. You can repair most of these problems yourself without hiring a professional. Often the issue is a technical oversight, such as not setting the thermostat properly. If you still cannot figure out what is wrong with your Carrier Programmable thermostat, you may need to call in a service technician.
Check the "System Switch." Make sure you have the Carrier programmable thermostat set to "Cool," if you want cold air, or "Heat," if you want warm air.
Inspect the circuit breakers in the breaker box. They all need to be on. If any circuit is set to "Off," switch it to the "On" position.
Look in the gray box on the wall by the outdoor air conditioning unit. Inside the box is a "Disconnect Switch." Make sure the switch is "on," and it if it isn't, flip it on.
Replace the HVAC filter. An old and blocked filter can cause the HVAC motor to turn off.
Shift furniture that is blocking the return air grills away from the grills. These are flat, long vents that are often found on walls. If these vents are blocked, your motor can turn off.