I have simple comfort 3001 thermostat. The PROG sign is flashing between two different target temperature and as a result (depending on the room temperature) the system is constantly turning on and off making a clicking sound. I tried to reset number of times but it did not work. I tried to reprogram without any result. Can someone please help? Is there a way I can disable any programming and operate it in non programming mode (I hit mode/prog button without any result).

Thanks in advance.