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International Comfort Products HXA236AKA1 Limit Switch
A normal limit switch has a sensor in the heat exchanger that determines when the heated air is warm enough so that it may be pushed through the ducts and out the vents. Limit switches are built because if the air is not warm enough then the house will never get warm enough.
Major warnings to watch for in a bad limit switch
- The system is beginning to behave erratically on a regular basis
- System will not begin the ignition sequence or run longer than 30 seconds
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