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International Comfort Products PGMD60G1156 Limit Switch
Limit switches exist because if the warmed air is too cool then the house will never get warm enough. A normal limit switch has a sensor in the heat exchanger that determines when the heated air is actually warm enough to activate the main blower.
Clues to watch for to know main limit switch is not going to last much longer
- The whole system begins to runs spotty from time to time
- System will not even start or run well even though the desired temperature has not been attained
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