Came out today for a no heat call. Upon arrival the homeowner stated that the system runs on a schedule but this morning it was under the desired temperature and the thermostat said recovery mode. I powered the system up and called for heat I observed the system starting normally and once it reached the desired temperature the system shut down. I explained to the homeowner that based on the information she is giving me and from what I’m seeing it is my opinion that either the batteries in the thermostat are bad of the thermostat is defective. After giving it some thought the homeowner opted to replace the thermostat. I replaced the old thermostat with a new Honeywell t4 thermostat serial #2213jjb48078. After the installation I tested the system by calling for heat and ac. The system is operating properly at this time.