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International Comfort Products H8MPT100F14A1 Limit Switch
A normal limit switch has a sensor in the air handler that makes the determination when the heated air is warm enough for the blower to be activated. Limit switches are built because if the warmed air is too cool then you will never get hot air through the ducts.
Important clues of an ineffective limit switch
- The HVAC system is starting to become inconsistent occasionally
- The heating and AC system will not begin the ignition sequence or will not stay running for any significant length if time
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