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International Comfort Products GNK050N12A3 Limit Switch
A normal limit switch has a sensor located in the furnace that decides when the heated air is actually warm enough for the air to begin normal home circulation. The main reason limit switches are made is because if the air is too cool inside the furnace to begin with, then you will never get hot air through the ducts.
Clues to watch for to know main limit switch should need replacing
- The HVAC system is starting to behave differently on a regular basis
- The HVAC system will not start or run well like it should
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