Not heating - Main level System nit heating due to a failed thermostat. The thermostat contacts for W “heat” has failed. I tested the wires and jumped them out at their thermostat to confirm. I went over a few options to address this problem. The homeowner opted for option A. I replaced the thermostat, added a common wire so the thermostat didn’t have to rely on batteries, and tested the equipment in both heating and cooling. Before replacing the thermostat I did go over the age and weak components on the system, and suggested replacing the equipment. The system is now heating properly. There is a 5 year parts warranty on the thermostat and we are going to honor a 2 year labor warranty given the circumstances. Thank you for choosing T.E. Certified, have a great day!