How to Replace the Fuses on a Central Air Conditioning Unit Your home is turning into a sweat box! It may just be that your overworked air conditioning unit blew a fuse. Here is how to replace the fuses on a central air conditioning unit so you can get back to what is really important--relaxing in your lounger with a tall, cool lemonade and chuckling as your neighbor is soaking wet, cutting his grass. Carrier Air Conditioner Fuse, Thermal Fuse & Breaker Parts Carrier Air Conditioner Fuse, Thermal Fuse & Breaker Parts - Shop online or call 800-269-2609. Fast shipping. Repair Help for Carrier Air Conditioner Repair Help for Air Conditioners . Carrier Air Conditioner Fuse. RepairClinic Item # 3392240. Grid is 1 inch square. Fuse 15a x agc15.