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Lennox G43UF-36C-090H Limit Switch
A normal limit switch is a switch in the heat exchanger that makes the determination when the air is warm enough so that it may be pushed through the ducts and out the vents. 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.
General indicators that your limit switch is in dire need of a replacement
- The heating and AC system will not start or run well even though max temp has not been reached
- The HVAC system starts to runs spotty often
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