Today, I repaired a Carrier Infinity 96 furnace in East Haven that was short cycling and not heating properly. After inspecting the unit, I found a cracked heat exchanger, which posed a safety risk due to potential carbon monoxide leaks. I shut down the system, replaced the exchanger, and checked for proper combustion. I also cleaned the burners and tested the flame sensor to ensure efficient ignition. After reassembly, I performed a full system test to confirm proper operation. The furnace is now heating efficiently, and the homeowner has peace of mind with a safe system.