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International Comfort Products NTC7100BHA3 Limit Switch
Limit switches exist because if the air is too cool inside the furnace to begin with, the you will lose all the heat as the air flows through the ducts. The limit switch is a switch located in the furnace that makes the determination if and when the air is warm enough so that it may be pushed through the ducts and out the vents.
Indications limit switch will have to be replaced
- System will not begin or run longer than 30 seconds
- The HVAC system is starting to runs spotty occasionally
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