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International Comfort Products GPSM36H080F Limit Switch
One big reason why limit switches are designed that way is due to the fact that if the air never warms up inside the exchanger then you will never get hot air through the ducts. The limit switch is a switch in the heating area that can determine when the air is warm enough for the blower to be activated.
Some clues of an unhealthy limit switch
- The system starts to erratically occasionally
- System will not begin the ignition sequence or will not stay running for any length of time
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