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International Comfort Products NDN5050BFA1 Limit Switch
The limit switch contains a sensor in the heat exchanger that decides if and when the air is warmed to a point so that it may be pushed through the ducts and out the vents. The main reason limit switches are made is because if the air is not warm enough the you will lose heat in the ducts and the vents will just blow cool air.
Chief elements of a defective limit type switch
- The HVAC system is unable to start or run longer that five minutes
- The system is beginning to run erratically frequently
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