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International Comfort Products GPFM24K040F Limit Switch
One big reason why limit switches are designed that way is due to the fact that if the air inside the furnace is too cool then you will never get hot air through the ducts. The limit switch contains a sensor located in the furnace that makes the determination when the air is actually warm enough for the blower to be activated.
Major indications limit switch will die soon
- The International Comfort Products system is beginning to behave differently from time to time
- System will not begin the ignition sequence or will not stay running for any significant length if time
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