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Furnace blower motor is fine, but the air conditioner unit will not start. when it gets a signal to come on there is a click as if a breaker is shutting it off.

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  • 949 Answers

Hi,

The click you are hearing may be the relay or contactor. If you hear the noise at the outside unit and nothing starts out there the problem could be with the fuse or breaker that supplies the high voltage to the condenser, as this is on a separate breaker than the furnace.

Check the large breakers in the main breaker box. If they are okay look for a box on the outside wall of your home near the condenser unit. It may contain a fuse or breaker in there. If those are okay then there could be a problem with the capacitor or contactor. You would have to check the voltage coming into the contactor and out. You should have 240 volts on both ends with the contactor activated.

Let me know if you have questions

Posted on Aug 08, 2010

  • 8 more comments 
  • juerigmusa Aug 08, 2010

    The Breakers both look good and are on. There is no fuse that I could see. Is the contactor on the side of the compressor a box about 2" square

  • Philip Aug 08, 2010

    Hi,

    The contactor is about 2" - 3" square and has 2 large wires coming in the bottom, usually about 4 going out the top and 2 very small ones on the sides.

    Here is a picture of one on it's side. The small wires may be on one side (brown and yellow shown here) or may be one on each side.




  • Philip Aug 08, 2010

    One more thing, even if the breakers for the A/C look good, try turning them all the way off then back on it may be partially tripped.

  • juerigmusa Aug 08, 2010

    I turned Breakers off and on and get a humming sound from the unit

  • Philip Aug 08, 2010

    If it is humming and nothing is running outside the problem is either

    - no high voltage to the condenser, (not likely since you check the breakers and no fuses were found),

    - a bad contactor (not likely since you are hearing the hum)

    - bad capacitor

    You would need a meter that reads up to 250 volts and can check ohms to go from here. Do you have access to a meter? If so I can walk you through what to check




  • juerigmusa Aug 08, 2010

    Now the unit is humming louder and heating up , but not running

  • Philip Aug 08, 2010

    Ok, Turn it off

  • Philip Aug 08, 2010

    Since I cannot hear over this website the hum you hear must have been the compressor running rather than the contactor. It would run and overheat then trip the breaker (either internal or external) this would explain why it started when you flipped them.

    The problem with the unit is the condenser fan motor. The compressor is running but the fan on top that cools the coils and compressor has failed. The motor can be replaced, it typically will run about $150 - $200 for the motor depending on the size and speeds. The cost for labor to have a professional put it in would be about $150.00 also.

    If you feel comfortable you can take this on yourself. It does take some work to get it apart and a bit of electrical knowledge to wire it up correctly.



  • juerigmusa Aug 08, 2010

    Thanks, I think your correct about the condensor fan motor because I hear the compressor kick in but fan motor will not run

  • Philip Aug 08, 2010

    Yes, it explains all your symptoms. Is there anything else I can answer for you?

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