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International Comfort Products N8MPL075B12A1 Limit Switch
A normal limit switch contains a sensor in the heat exchanger that determines when the heated air is actually warm enough that it can be circulated throughout the house. A limit switch was crafted because if the air is too cool inside the furnace to begin with, the you will lose heat in the ducts and the vents will just blow cool air.
Hints of a declining limit type switch
- System refuses to start or run well even though the desired temperature has not been attained
- The whole system starts to act differently occasionally
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