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Have an old york system turn off ac at thermostat fan keeps blowing wont shut off

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Replace the fan relay.

Posted on Jul 24, 2009

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Would a closed thermostat stop the radiator fan from turning on when the temperature is within heat range.it turns on when I turn ac on,is that a different cause when not using ac.


There are two different thermostats--one in the cooling system, and one just to turn on fans. The AC has a separate circuit to turn on fans regardless of engine temp, so tind the the fan thermostat and test it.

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Ruud ac wont come on. mfg 03/99. thermostat


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AC wont kick on....


The first thing to check is your breaker box. There should be one double breaker for the air handler unit, that's the inside unit, and one double breaker for the compressor, that's the outside unit. Check both breakers. If you're not sure if they've be thrown, click them toward the outside of the breaker box (off position) and then click them toward the inside of the breaker box (on position). If the breakers are on and you still are not getting any A/C take a look at your compressor, (outside unit). If the fan is running at least you're getting power. However, your compressor down inside the unit may not be getting power or it may need to be replaced. The compressor has a start-up cap. If this cap goes bad or the wires from this cap fry or corrode away, this will also keep the compressor from starting but the fan will still run. If the fan is not running it could be caused by a faulty relay inside the compressor cabinet. This relay is supposed to open and close based on a low voltage signal from the thermostat. I believe it's roughly 24 volts. This relay switches on and off the 240 volts for the compressor and the compressor fan. Often this relay goes bad or the wires leading up to it fry. If you?re going to work on the unit yourself make sure all power is shut off. There should be a shutoff switch on the outside wall near the compressor. I?d also shut the breakers off.

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Dometic AC that the fan shuts off but the compressor keeps running


call dometic dealer. I hear they have a bad circuit board that is replaced.

Jun 02, 2009 | Dometic Rooftop RV Air Conditioner

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I have a 4 wire thermostat - Red, White, and 2 Green. I had originally marked each wire by matching with the old wired thermostat. I had some AC work done, today. The tech took off my markings. Now, the...


First make sure he didn't accidentally push the fan button to "on" instead of "automatic". If he did, switch it back to automatic and it will soon go off when the compressor stops running.

If that doesn't do it, and you're certain the red and white are properly wired, then go ahead and switch the greens. But I'd turn the breaker off first.

Sirwriter

May 15, 2009 | Hunter Fan Company 5/1/1 Programmable...

1 Answer

AC wont shut off


check the switch under the Thermostat that says "Fan" Make sure it is set on "Automatic.
If that helped please Rate Me.
Thanks
George

Apr 27, 2009 | Heating & Cooling

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