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Carrier 48XL-A48 Limit Switch

The limit switch has a sensor in the heat exchanger that determines if and when the air is warm enough that it can be circulated throughout the house. Limit switches are crucial because if the air is not warm enough the you will lose all the heat as the air flows through the ducts.

What signals that my main limit switch is dying?

Check eBay to see if your limit switch is in stock!
Before buying or purchasing any Carrier 48XL-A48 replacement part do your best and make sure of the correct model and also make a visual comparison in order to be sure the proper replacement limit switch is the one being purchased. If you are unsure about installing the new limit switch by yourself then it is probably best to find a professional in your area to do the work for you.
Feel free to download your manual for help.
Check eBay for your limit switch!