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We have recently purchased a new home and the UBHK-25J21SFA air handler makes a whistling little tune and then the heat comes on. Never fails to work but noise is annoying.

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  • 571 Answers

Make sure the air is balanced... air handlers are rated @ a certain design static pressure. The static rating is on the air handler tag. Have someone measure that static. Too often hvac installers don't know much about airflow & they will undersize ductwork. Then again it could just be a dirty coil.

Posted on Dec 07, 2013

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Posted on Jan 02, 2017

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SOURCE: Home AC Air Handler is making Annoying clicking sounds randomly

It sounds like the problem is with the louvre swing motor which is either opening or closing the louvre but not stopping at the end. This is due to a faulty intergrated circiut (IC) programmable chip on the PC board. Only way to get around it is to replace the board.

Posted on Jun 10, 2009

james3751
  • 614 Answers

SOURCE: Air Handler leaking

First make sure unit is level. Drain pan may be dirty. On the rheem or Ruud unit the back of the pan gets stopped up. Ithas small holes that let the water by and they get stopped up. Now even though your drain is clean you may have a stopped up dain pan. Check this > These are problems you can take care of your self. Open up the top panel of your unit and you can look down on the drain pan. Check for dirt and stoppage near the outlet of the drain pan. You amy also have a cracked drain pan but I doubt it. Rus

Posted on Jul 14, 2009

  • 34 Answers

SOURCE: air handler fan appears to cause thumping noise

If it's a belt drive check the belt or the pulley could be worn. If it's direct drive check to se if something is in the fan wheel causing it to be out of balance.

Posted on Sep 11, 2009

SOURCE: air handler running but nothing coming out of

Shut unit off, remove door that would have the blower
located in it. Make sure that the blower motor has not seized up. Try to spin it with your hand.

If the unit starts up ,fires up and shuts down all the time, more than likely the blower motor is the problem

Posted on Feb 13, 2010

  • 420 Answers

SOURCE: whistle noise from the air handler

Check the filter and change if dirty or restricted. Make sure the blower access panel is secured. Make sure the cooling coil is clean on the top (outside) and on the bottom (inside).

Posted on May 27, 2010

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First make sure unit is level. Drain pan may be dirty. On the rheem or Ruud unit the back of the pan gets stopped up. Ithas small holes that let the water by and they get stopped up. Now even though your drain is clean you may have a stopped up dain pan. Check this > These are problems you can take care of your self. Open up the top panel of your unit and you can look down on the drain pan. Check for dirt and stoppage near the outlet of the drain pan. You amy also have a cracked drain pan but I doubt it. Rus

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