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Air handler fan appears to cause thumping noise

Air handler fan appears to be causing thumping noise in air handler assembly

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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

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How to stop the fan of rth6300 thermostat


If your fan will not stop, it could be caused by several things. It could be the contacts inside of the thermostat sticking. It could be caused by the fan mode switch in on versus auto. It could be a sticking contact on the fan control card in air handler or a stuck contact in the fan control head if it is a X13 or ECM motor.
First, easiest way to see if stuck contact on the thermostat, gently tap the thermostat, this sometimes adgitates the contact and allows it to open. If this works you need a new thermostat.
Next problem is checked on the themostat fan mode switch, it should be in auto. I have had several customers who inadvertantly pressed the fan mode switch and did not know they had done it.
If the fan is still running, the problem is in the air handler fan control card. There is high voltage in and near the fan control card and I would recommend getting a professional to check it out. The voltages in most thermostat is about 24 volts and even though it can tingle you it is not generally harmful. The high voltage you get into the air handler can either be 240 volts and in commercial unit it can be 440 volts.
Hope this helps.

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Ruud ubha-21j00nuaa


Can you see the condition of the coil itself? If it is blocked this could be a cause for the frozen coils. Also, check the condition of the blades on the indoor fan. Dirt and dust accumulation on the blades reduces airflow.

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Sounds like your fan motor is coming loose from the mounts or your squirrel cage is loose or loosening. That's just the air handler, the compressor is outdoors in the condensing unit. Pull that air handler apart and find out what's causing it, or shut it down. This can hurt you if the fan flies out of there.

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Flame failure. It could be caused by lack of fuel or overheat because of dirty fan or dirty fan cage. If you hear the pump make a loud ticking or thumping noise then you have a fuel issue.

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When the central air turns on it is very loud. I assume its the fan or whatever is in the attic. it sounds like a really loud regular window air conditioner on high coming through all of the vents. Is this...


No. This can be caused my a dirty squirrel cage on the blower motor which is found in your air handler in the attic. Probably needs to be pulled out and cleaned. This noise is caused by the blower wheel out of blanace.

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Air handler is running but outside unit fan is not running. Just a buzzing noise.


The buzzing if it is real loud is a very wore out contactor and could be the cause of your unit not running. Check your circuit breaker. you'll likely need service and have the unit cleaned for best performance. Good luck Tom

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