Question about AmcorAire UCHW-H12AF2 Split System Air Conditioner

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Inside blower fan barely running

I have a new system that was just installed but the inside blower fan will not run but at one speed, VERY slow. The unit freezes up very quickly with very little air running over the coils.

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  • Ron Hubbard May 21, 2009

    It turned out that the set screw on the impeller shaft was loose. I was able to get in and tighten it and all is good.

  • Ken Bledsoe May 11, 2010

    Did a professional install unit? He or she should have checked unit out before the job was done. Call them back out they would like to know about the person doing the job did. The fan motor is a milti speed motor and can be wired up wrong

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  • Contributor
  • 478 Answers

Look at the control board for dip switches also the black lead(fast) should be on ac terminal. If the indoor coil is too small or there is restrictced air flow can also cause this problem,

Posted on Mar 12, 2009

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1 Answer

Inside blower wont run


Sounds like you need a new board. Their are people out there that will replace the fan relay on these boards, but I have always just replaced the whole board with a new one. These boards can range from around $50 to $300 depending on which board it is. The way we always double check these boards are exactly the same way you have done it, only we use the 120v from the units transformer and bypass the board, if your fan comes on, your board is not sending the power through to the terminals. It would be different if nothing else on your system was working too. I hope this helps and good luck!

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That's a weird problem. I wonder if the outside compressor is drawing down the voltage in the breaker box enuff to keep the blower from starting up. If you're set to cool but the thermostat is NOT calling for the AC, can you manually turn the blower on fathfully? If so, I would check all wiring connections in the breaker box to make sure they are tight and free from tarnish or corrosion. You may even need to contact your power company and have a higher amperage line installed outside. Do your house lights blink noticably when the compressor kicks on?

While you're resolving this, you could start the blower manually and just leave it on. The compressor cycling on/off shouldn't stop the blower once it's running and it won't draw much current... couple bucks a month maybe.

Hope that helps...

Geno

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