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International Comfort Products PHAD30N1K1 Limit Switch
The limit switch is a switch located in the furnace that makes the determination if and when the air is actually warm enough so that it may be pushed through the ducts and out the vents. Limit switches exist due to the fact that if the air inside the furnace is too cool the you will lose all the heat as the air flows through the ducts.
Major symptoms limit type switch needs replacing ASAP
- The whole system is starting to run erratically more than once
- The heating and cooling system will not start nor will it stay running even though the desired temperature has not been attained
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