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International Comfort Products GPCM60K140F Limit Switch
Limit switches exist because if the warmed air is too cool the you will lose heat in the ducts and the vents will just blow cool air. The limit switch is a type of sensor switch in the heat exchanger that can determine when the air is actually warm enough to activate the main blower.
Major clues limit switch has very little life left
- Your system starts to runs spotty on more than one occasion
- System will not begin the ignition sequence or run well even though max temp has not been reached
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