Just this week thermostat was not on, flipped circuit(not blown) thermostat went on. Has happened 3 more times today. House is one and half years old. Took cover off checked connections. What is causing this?

You have to explain a little better what happened and what you did. Is the furnace flipping the breaker,What turned on the thermostat??

The furnace never blew the circuit either did the thermostat. Just by flipping the circuit on and off the thermostat went back on. It is a nonprograble digital carrier thermostat. Idid remove the cover and checked all the connections,semmed fine.

Bad wire connections on either Red or common wire or a bad thermostat. Is it hard wired to the furnace? Or does it have batteries?

The thermostat is hard wired to the furnace. Thanks for the help