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International Comfort Products C9MPD125L20C1 Limit Switch
A normal limit switch is a type of sensor switch located in the furnace that determines when the air is warm enough for the blower to be activated. The reason limit switches exist is because if the air is not warm enough then the house will never get warm enough.
Major indications limit switch is in dire straights
- The heating and AC system will not start or will not stay running longer than 30 seconds
- The whole system starts to go through the startup sequence but stops quickly on a regular basis
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