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  1. #1

    Wink Reversing valve stay in a/c mode

    work on 2 ton heatpump comfort maker yesterday, found unit stay in the cool mode, with t- stat calling for heat.( heat and cool work together)

    switch O and B terminal at t-stat,RV still doing a/c, knock on RV a few time it does't make any different.
    checked the charging on a/c mode was correct, RV making one click clear noise ,it look like working as it should, switch RV wire at defrost board it does't help either.
    called boss, said replaced the RV ,its bad.
    so i think it may be something else i can try to get it work correctly before i change the RV.
    any idea guys,
    will appreciate any comment thanks.

  2. #2
    Join Date
    Jan 2007
    Location
    in my lumpy chair
    Posts
    1,946
    i would have to agree with your boss

    even if its not the problem, its the bosses fault
    I dont warranty Tinkeritus

  3. #3

    Lightbulb Be Safe

    Disconnect All Wires From The T-stat On The Board And Jump Short Piece Of Thermostat Wire With R,y,w And G And Check For Heat, It's Came Bad T-stat Replace It Good Luck

  4. #4
    Join Date
    Jun 2003
    Location
    Florida
    Posts
    9,548
    this is where your clamp on thermometer should be used to check rv
    If everything was always done "by the book"....the book would never change.

  5. #5
    Join Date
    Dec 2006
    Location
    Middle Tennessee
    Posts
    11,347

    *

    sounds a little DIYish to me



    .

  6. #6
    Join Date
    Mar 2007
    Location
    Myrtle Beach, SC
    Posts
    2,919
    Comfort Maker energizes the reversing valve in cool. The reversing valve coil should be wired to "O" from the thermostat. Take the wires off the the reversing valve coil, it should switch to heat. If it does not, and the compressor is running, the reversing valve is bad! Replace it.

    Note: that clicking sound you heard was the pilot valve in the reversing valve. Within a couple of seconds of hearing that click, it should have reversed. Since it did not, you have a bad valve.

    Electricity switches the pilot valve. The pilot valve switches the Freon pressure. Freon pressure switches the reversing valve.
    Remember, Air Conditioning begins with AIR.

  7. #7
    Join Date
    Oct 2007
    Location
    Another hot rooftop somewhere...
    Posts
    80
    Quote Originally Posted by Kevin O'Neill View Post
    Comfort Maker energizes the reversing valve in cool. The reversing valve coil should be wired to "O" from the thermostat. Take the wires off the the reversing valve coil, it should switch to heat. If it does not, and the compressor is running, the reversing valve is bad! Replace it.

    Note: that clicking sound you heard was the pilot valve in the reversing valve. Within a couple of seconds of hearing that click, it should have reversed. Since it did not, you have a bad valve.

    Electricity switches the pilot valve. The pilot valve switches the Freon pressure. Freon pressure switches the reversing valve.
    You beat me to it Kevin, that is exactly what I was going to suggest, good answer.
    Screaming at me like a jack*** doesn't work because the air works in my truck and at home!

    I was looking for a job when I came here and I'll be looking for one when I leave!

    Yeah boss, the Model# starts with j and ends with k!

  8. #8
    Join Date
    Jun 2001
    Location
    Louisville, KY
    Posts
    12,031
    Quote Originally Posted by Airmechanical View Post
    sounds a little DIYish to me
    It's not.
    Perhaps you should have read the instructions before calling.

  9. #9
    Join Date
    Dec 2002
    Location
    Arizona
    Posts
    4,247
    Quote Originally Posted by mrfahrenheit View Post
    any idea guys,
    will appreciate any comment thanks.
    Disconnect the leads to the condenser fan motor, run the unit in the cooling mode,( assuming your unit energizes on cooling) when high side pressure is @ 400lb exercise the reversing valve bye disconnecting then reconnecting the low voltage wire. do this quickly and a number of times . I have broken lose stuck reversing valves many times this way. if that does not work change the valve.

  10. #10
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    66,820
    While its running in cooling mode. Pull one of the RV wires off at the board. If you hear it click, but it doesn't change over. The RV is stuck/bad.
    Contractor locator map

    How-to-apply-for-Professional

    How many times must one fix something before it is fixed?

  11. #11
    Join Date
    Jun 2004
    Location
    Howell, Michigan
    Posts
    16,158
    But it's getting way to technical to be in this forum. To all the tech's that are new here, this is better off discussed in the Pro Tech forum.

    Apply For Pro Membership Here









  12. #12

    Smile Reversing valve stay in a/c mode

    thanks for all the input guys,

    i did replaced the reversing valve, and unit working properly.
    thanks to you all.

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