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  1. #1

    A/C condenser turns off randomly

    I am having a repetitive problem with my upstairs A/C unit. It is a ~12 yr old York HLRA048S06D 4-ton 10 seer (?) unit. When it works, it blows crisp cool air in the 100+ temps we've been having here in TX. When it doesn't, the interior fan continues to turn on when needed, but the outside condenser unit does not turn on, and the upstairs does not cool. For the last week, it seemed to be limited to nighttime when it shut off, but this weekend, it was off for long periods during the day as well, turning back on randomly. I noticed this weekend as well, in the mornings when I turned it on manually to check, the fan was not spinning and there was a buzzing sound coming from the unit. I left it on, with the interior fan blowing and the condenser not on. Later on though, it started to cool once again.

    I had an A/C technician come out to check on it in the afternoon, but by the time he came, it started working again, and as it was blowing cold air he could not diagnose anything wrong. The condenser fan spins freely, no breakers are tripped. He didn't go upstairs into the attic to check on the furnace, was there anything else he should have done? Am I able to bring in a technician again even though it's random when it goes on or off?

    Thanks

  2. #2
    Join Date
    Dec 2010
    Location
    Palm Beach,Fl.
    Posts
    987
    The buzzing sound is a solid clue. A good technician can usually nail an intermittent issue down through a handful of checks. Blowing cold air is not a diagnosis. Sounds like there are several things that he should have done that didn't happen. Definitely get another tech to take a look at the system. Next time you find the unit inoperable, turn off the T-stat. You may be damaging very expensive components that can easily be saved.
    Quote Originally Posted by k-fridge View Post
    The laws of physics know no brand names.

  3. #3
    Thanks, I have a home warranty so I plan on having someone different come out to diagnose. Is there anything specific they should be looking for, with an intermittent buzzing noise? Everything's intermittent which adds to the frustration.

  4. #4
    One week later and while it has been shutting off more often, it is still random. I did capture the buzzing/screeching noise - I wonder if any pros here might recognize what it could be. My home warranty company is not allowing me to use another tech (unless I pay another service fee), so I'm stuck with the original one for now, and I wonder if he can diagnose based on this.

    http://www.youtube.com/watch?v=EJp8Q...ature=youtu.be

  5. #5
    Join Date
    Dec 2002
    Location
    Houston,Tx.
    Posts
    16,011
    Internal relief is giving your compressor a stroke, don't run it without the fan turning, you will just cause more damage.
    __________________________________________________ _______________________
    “Experience is a hard teacher because she gives the test first, the lesson afterwards". - Vernon Law

    "Never let success go to your head, and never let failure go to your heart". - Unknown

  6. #6
    Join Date
    Apr 2012
    Location
    winnipeg
    Posts
    1,330
    hello the condenser fan is not running....... why would you let the poopr compressor run with no fan.....make no sense
    it was working.... played with it.... now its broke.... whats the going hourly rate for HVAC repair

  7. #7
    That's just it - it makes that noise, stops, then works fine with the fan on later on. This doesn't always happen when it comes on, only some of the time. Other times, it doesn't make that noise, it just doesn't turn on when the t-stat turns on.

    Is that noise for sure the compressor?

  8. #8
    Join Date
    Dec 2010
    Location
    Woodbridge Twp, NJ
    Posts
    1,308
    SHUT IT OFF!!!!!! It's crying for help!
    Every customer you take for granted today will be someone else's tomorrow.

  9. #9
    Join Date
    Apr 2012
    Location
    winnipeg
    Posts
    1,330
    get the fan working........ its gonna blow up soon
    it was working.... played with it.... now its broke.... whats the going hourly rate for HVAC repair

  10. #10
    Join Date
    Feb 2009
    Location
    Tallahassee, FL
    Posts
    6,051
    Looks like they have installed a incorrect fan motor. Imo.

  11. #11
    Join Date
    Apr 2012
    Location
    winnipeg
    Posts
    1,330
    a heat pump..... its a 100 outside everywhere....... oh i see it thinks its winter...lol
    it was working.... played with it.... now its broke.... whats the going hourly rate for HVAC repair

  12. #12
    Join Date
    Sep 2008
    Location
    Western PA
    Posts
    25,723
    Huntinwalkerstyle

    This is the Ask Our Pro's forum. In order to post a response here, you must have verified qualifications and have been approved by the AOP Committee. You may ask a question by starting a new thread.

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  13. #13
    Join Date
    Dec 2002
    Location
    Houston,Tx.
    Posts
    16,011
    With the pitch on the fan, that's looks like it should be an 825 rpm motor, is it?
    __________________________________________________ _______________________
    “Experience is a hard teacher because she gives the test first, the lesson afterwards". - Vernon Law

    "Never let success go to your head, and never let failure go to your heart". - Unknown

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