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International Comfort Products NTG3075FBA2 Limit Switch
One big reason why limit switches are designed that way is because if the air is not warm enough the you will lose all the heat as the air flows through the ducts. The limit switch has a sensor located in the furnace that determines if and when the air is actually warm enough that it can be circulated throughout the house.
Some clues limit type switch is not going to last much longer
- The HVAC system will not initiate or continue to run even though max temp has not been reached
- The International Comfort Products system is starting to stop suddenly time after time
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