Question about Ruud Air Conditioners

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I have a Ruud air unit model number PX402. we had lost power dur to Tropical Storm Fay, when the power came back on the fan will run but the cooling system won't do anything, if it is in the off position it makes an intermitten buzz. The word Malfunc. came up on the screen where you view the temp . There is a little black switch in side the cover is this a reset switch.

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"You can't be sure whats in the cracker barrell, till you take the lid off!" (try it.)

Posted on Aug 22, 2008

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You didn't mention if you checked for 115 volts at the power supply to the air handler. The unit outside has its own power supply. A lot of times the switch that is on the wall doesn't like to work after its been turned off and back on for service, also check the blower door safety switch. If the blower door hasn't been put back in place properly and snugly it will kill power to the whole air handler. Hope this helps. Good luck

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1 Answer

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try spinning by hand when the unit make the buzzing sound. to see if the capacitor is bad. If the fan runs replace the cap. If not motor probably is bad. See if it spins freely. this is a good starting place. need to check if the buzzing is the contactor and there is no power to the condensor. The contactor will buzz even though the main breaker is off or tripped

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If only the fan is stuck on, you've most likely got a stuck fan relay. Replacements are available at HVAC supply stores and most will sell to the public. Not a real difficult fix but BE SURE to pull the electical disconnect AND flip the breaker OFF before you attempt any repairs.

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