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I have a rudd central air unit. The fan on the outside of the unit is not running. What could be wrong?

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First check that you didn't drop a leg from your power service.

If there's power to the fan and it's humming like it's trying to turn, then you could have a bad fan or bad start capacitor. Pull the disconnect and check to see that the fan spins freely and does not wobble on its axis, if so, the fan is most likely ok. Replace the start capacitor.

If there is no power going to the fan, then there are several different ways to go. Check the fan first.

Posted on Aug 14, 2008

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Rudd A/C. Why does the fan run constantly and the outside unit doesn't turn on?


could be a outside power board
could be that the temperature setting equals the atmospheric temperature and not turning the outside unit on as it is not necessary

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When air handling unit stops it would make a shuddering sound.Now it won't run at all. Outside fan is working Tried to run just fan on the thermostat still will not run .It is a RUDD model...


hi,
The indoor blower squirrel cage or the motor went bad....
Open up the air handler and check the blower... you will find the problem right there...

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The switch that you are resetting is the manual reset high pressure switch. It is there for a reason, to tell you something is wrong. You having to start fan manually tells me that the fan run capictor is bad. Get the capictor changed. If you keep resetting the switch you could burn out the compressor, doesnt make any sense to burn up a 800.00 compressor for a 10.00 item. hope this helps.

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Rudd Achiever series model RQNJ-AO42JK 000 mfg


Turn the thermostat as low as it will go and have someone stand out side, they should here the condensor fan and compressor come on at the same time. They are two distinctive sounds so you should
be able to tell if the compressor is running.

If nothing happens and you are skilled with electrical
you can turn power off and remove the electrical
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starts you have a thermostat or low voltage problem.

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1 Answer

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I don't think the fan on it' own crates the problem. Could you find out what should be and what actually is the flow through it. If you needed <!-- MOJAIZBA.COM LINK CODE START --> <a href="http://mojaizba.com/convert-units-of-flow" title="Flow units converter page on mojaizba.com - Convert flow units online. Use the calculator for making conversions from one flow unit measure into another flow-volume amount between; acre foot per: acre-ft/day, hour acre-ft/hr, year acre-ft/yr, bar/day barrel Oil per day, hour bar/hr, minute bar/min, second bar/sec flow, cubic centimeter per day cm3 / day, hour cu cm/h, minute cm3/min, second cm3/sec flow, cubic foot feet per day ft3/d, hour ft3 / hr, minute ft3/min, second cuft/sec, cubic inch per day in3/day, hour in3 / hr, cubic inch per minute cu.in/min, in3/sec, cubed meter per day m3/day, hour cu m/h, minute m3/min, second m3 / sec, cubic yard per day yd3/day, hour cu yd / h, yd3 / min, cu-yd/sec, gallon US gal/day, gal/h, gal/min, gal/s, gallon UK per day gal/d, gal/hr, gal/minute, gal/sec, hundred cubic feet foot per day 100 cu-ft/day, 100-ft3/hr, hundred cubic foot per minute flow 100ft3/min, 100 cubed ft/sec, kilogram per day - Petrol kg/day, hour Gasoline kg/h, kg/min, kg/s, liter per day l/day, l/hr, l/min, l/sec, milliliter per day ml/d, ml/h, ml/min, ml/sec flow, ounce US per day oz/d, oz/h, oz/min, oz/s, ounce UK per day oz/day, oz/hr, ounces/min, oz/sec, pound per day - Petrol flow lb/day, Gasoline lb/hr, lb/min, lb/sec. USA – Imperial UK and Metric SI system units of flow. Buy the JavaScript JS and HTML code for this web flow converter tool application for your website." target="_blank">flow units converter</a> <!-- MOJAIZBA.COM LINK CODE END --> for a unit you'are comfortable with here is one we use if it's necessary. Let me know that...

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is the unit running outside? did you check the breaker? Ruud units often times will have a reset bitton on the outside unit to the left of where the freon lines connect. It is a high pressure switch if it comes on when reset make sure the coil is clean and the fan runs(outside)

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Check to make sure that your contacts are ok and the fuses on the main breaker disconnect are ok. If those are good then replace the fan motor

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ok it unit is a central I'm suspecting a voltage transformer is defective you see these units need 24v to turn on certain components but if your air handler turns on, your getting 24v to the fan relay, the problem would be elsewhere. if your handy with a volt meter open the thermostat(if applicable) put the meter on ac volts and measure to see if there's 24v between the R and Y terminals

if so your cooling contactor is defective. (If you get 24 v and unit outside dosen't turn on) if there isn't some fuse on the air handler control board blew out.

you can e-mail me @ hvac.tech7872pr@gmail.com if you need more info

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