Question about Ruud UAMB Air Conditioner

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When cooling cycle cuts in, thair handler fan turns on but does not get up to speed

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  • Ruud Master
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Hello, sounds like a weak capacitor. Replace capacitor and fan should run at full speed.

Posted on May 19, 2011

Testimonial: "A well done byall respondents. Thank you"

  • braveknave May 19, 2011

    Sorry for the information I gave you about the model number. I shall return with he right model number and would appreciate a new diagnosis of my problem. thank you much for your efforts in my behalf...

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1 Answer

Goodman air handler ARUF036-00A-1A does not blow air in heating or cooling mode only hums/buzzes, what could it be?


Looking at the wall thermostat, you will see the fan switch that has two settings: fan auto, fan on.
You will need to place the fan switch in the fan on position for testing purposes.
This will make the indoor fan run continuosly, and never cycle off.
In the fan auto position, the fan will turn off when the thermostat temperature setting has been satisfied.
Remove the air handler access panel.
Is the air handler fan operating?
If the fan isn't working see if you can listen closely if it is humming, or can touch the motor to see if it is hot.
If it is humming and has a bad capacitor, you can tell this without having an electrical tester by spinning the fan wheel by hand.
Be very careful... making sure your hand won't get cut by the fan wheel spinning when it starts up.
If the fan spins and picks up full speed, replace the defective fan capacitor.
It is the shiny silver metallic cylindrical object with electrical wires attached to it.
Make sure you write down where those wires attach and turn the power off before removal as they carry 240 volts to the fan motor.
If you find that the fan wheel doesn't turn freely when you try to spin it by hand, the bearings have seized and you will need to find another fan motor of the same size, shaft length , speed , and horsepower to replace the defective motor.
Keep in mind that a humming sound in the air handler COULD be from the transformer instead of the fan motor.
The transformer is a black cube shaped device with electrical wires attached to it.
If the 24 volt transformer goes bad, your thermostat will not function and nothing will come on.

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The Gibson GB5VM's ECM variable speed motor includes 12 field-selectable cooling airflows and 4 heating airflows to match any application. This Gibson air handler's quiet blower operation is achieved through extra quiet and smooth blower on and off cycles. Consult with your INSTALLATION & OPERATING MANUAL provided from your local Gibson Installation Team. If you cannot locate one, you can call GIBSON 24/7 at toll free 888-701-5040

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1 Answer

Air handler fan cuts on runs a few minutes and then cuts although thermostat is set to off.


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1 Answer

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Your main concern is the temperature difference across the indoor coil for both heating and cooling. When you turn your thermostat from auto to on, you are on high speed.

If you have long duct runs and little return air registers then high speed
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What they installed is sized for your house and the speeds should not have to be changed unless the ductwork is not sized right for the house.
Cooling should be High-Black wire.
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From your discription... I would think you have a problem in the thermostat. Does the fan run in cool if you put the fan in the ON position. Some older t-stats have a jumper between terminals that brings the fan on in cool. You will need to find out if there is low voltage power between the green t-stat wire and common in the air handler. If you have a Gas furnace the fan comes on by a temp control also there is a door switch. If the door is off the door switch will be open. and no fan.

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