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International Comfort Products T8DNL100L20B1 Limit Switch
The limit switch is a switch located in the furnace that decides when the heated air is warm enough so that it may be pushed through the ducts and out the vents. One big reason why limit switches are designed that way is because if the air is too cool inside the furnace to begin with, then you will never get hot air through the ducts.
Indications limit switch is going to die
- The HVAC system will not begin or continue to run longer than 30 seconds
- Your system starts to shut down unexpectedly on more than one occasion
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