Question about Ruud Heating & Cooling

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My Ruud furnace used to regulate 1 deg +\- the set temp. Now it regulates right at the set temp and the fan cuts off while the burner continues to fire for a minute or so then the fan kicks back on for another few minutes then it kicks off. But now the furnace tends to kick on more often than before when it was regulating +/- 1 deg around the set point. How do I fix this?

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Hi,
It appears to be the fan limiter switch. It comes on at a certain temp when heating up and shuts off on the high end of its setting. Once the burners are shut down, the fan continues for a few minutes to cool down the burners. The limiter switch is adjustable but it sounds to me to be defective and should be replaced. Good luck and stay warm, :-)

Posted on Mar 15, 2011

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