Question about Heating & Cooling

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My carrier air conditioner is not working. We have two exterior units. One for upstairs (smaller) and one for the downstairs(larger unit). That being said we have two seperate thermostats inside our home. The upstairs unit is working fine. The downstairs thermostat shows on Auto that the unit should be kicking on based on the temp. However, the outdoor unit for downstairs is not working. So far I have checked the downstairs vents and they are blowing air although not very cool. I also turned the switches for both units on and off in the breaker box. Upstairs unit cut on and off fine- the larger outdoor downstairs unit did nothing. Where should I look now? Thanks, Mother of 6

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  • henderson768 Sep 16, 2010

    Thanks- would you be able to give me some step by step directions on how to check these possible problems you listed.

    mother of 6

  • henderson768 Sep 17, 2010

    Sorry it took so long to respond. The fan motor is definately hot. Also the breaker is off but i can still hear a humming sound coming from the compressor area of the heat pump. Didn't have a voltage meter yesterday so I didn't want to go any further with the fear that the capacitor might still be holding some juice(shock) even with the breaker off. My brother is bringing a voltage meter over today- I really think it could be the fan motor.



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The problem is in the outdoor unit...
The compressor could be locked up, the condenser fan could be bad... or from what you are saying the contactor for the outdoor unit is either not pulling in or is bad...that also can be a result of a high or low pressure switch tripping...
So as you can see there are many possibilities...but all are related to that outdoor unit...

Air Conditioner Trouble - Review the Possibilities


Posted on Sep 16, 2010

  • 1 more comment 
  • D. Floyd Kolb
    D. Floyd Kolb Sep 16, 2010

    With out an electric meter it is hard... do you have acces too and know how to use one???

    Check that you have electric to the unit...also check for 24v single coming to the unit to tell it to turn on...

    Is the compressor hot?

    Is the fan motor hot?

    This will get you started troubleshooting this..


  • henderson768 Sep 17, 2010

    after checking voltage and confirming electric to unit- we then disconnected the compressor so as just to have power going to the fan- it became extremely hot very quickly- concluding that the fan motor is bad. Thanks for your help. One quick question- capictor is fine now but is it necessary for it to be replaced along with fan motor to prevent future quick burn out of new motor? Thanks again

  • D. Floyd Kolb
    D. Floyd Kolb Sep 17, 2010

    Yes, the humming is the contactor pulling in, so the indoor unit is trying to make the unit run...
    if the fan motor is hot and it is not running, that is your may have to reset the high limit control once you replace the fan to get the compressor to come on then...
    Let me know if you need help with that...
    but for now it looks like you need a fan motor...

    check out for a motor...




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