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  1. #1
    Join Date
    Jul 2008
    Posts
    26

    Frown Need Help...Outside unit will not shut off

    Hey all....I have a problem with my outside unit not wanting to shut off. I just recently graduated from an HVAC program, but I am stumped as to why my unit will not shut off unless I switch it off of cool from the furnace. For some reason when I switch the thermostat off of cool, the outside and inside units will not shut off. I can turn the temp above the temp in the house so it will kick off, but it wont. I have even turned the switch on the furnace off of cool, and tried to just run the fan in the on position and it will not kick on...the only way I can turn on and off my unit is to use the switch on the furnace.....I am completely stumped as to why it is doing this...I have even went out and check the contactor...and it seems to be working fine. Can anyone help me out.

  2. #2
    Join Date
    Nov 2000
    Location
    Eastern PA
    Posts
    68,981
    Bad stat or short in wiring. No detailed troubleshooting in this area of the site. Get 14 more posts under your belt and apply for professional membership and we can discuss this in more detail on a professional forum on this site.
    Government is a disease...
    ...masquerading as its own cure…
    Ecclesiastes 10:2 NIV


  3. #3
    Join Date
    Jan 2004
    Location
    PA
    Posts
    68,773
    Put the old stat back on.
    Contractor locator map

    How-to-apply-for-Professional

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

  4. #4
    Join Date
    Mar 2005
    Location
    Houston, Texas
    Posts
    11,874
    Ants.

  5. #5
    Join Date
    Jun 2008
    Location
    west point, ga.
    Posts
    328
    Is it a mobile home furnace and you tried to put a new t-stat on.

  6. #6
    Join Date
    Nov 2000
    Location
    Eastern PA
    Posts
    68,981
    Quote Originally Posted by the dangling wrangler View Post
    Ants.
    Bugs wouldn't cause the indoor unit to operate or wouldn't allow the outdoor unit to shut down by turning off the furnace power. It has to be in the control system.
    Government is a disease...
    ...masquerading as its own cure…
    Ecclesiastes 10:2 NIV


  7. #7
    Join Date
    Jun 2008
    Location
    west point, ga.
    Posts
    328
    Quote Originally Posted by RoBoTeq View Post
    Bugs wouldn't cause the indoor unit to operate or wouldn't allow the outdoor unit to shut down by turning off the furnace power. It has to be in the control system.
    He never said he cut the power off to the furnace.

  8. #8
    Join Date
    Jul 2008
    Posts
    26
    I never put a new T-Stat on, but yes it is in a mobile home...it is a Coleman Presidential Energy Saver A/C unit and a Presidential III Furnace Unit. The thing is when I have the T-Stat in the off position...the A/C still runs, that is with the Cool switch turned on on the furnace. The only way it will shut off is if I Switch it off of COOL on the furnace. if I turn the cool switch off I can go to the t-stat and try to turn the fan to the on position and it doesnt even do anything....I have even tried to turn it to Heat mode..and nothing happends...the only thing I can think of is a faulty T-stat

  9. #9
    Join Date
    Jun 2008
    Location
    west point, ga.
    Posts
    328
    I don't remember but I think the t-stat is a 2 or 3 wire t-stat.It is simple to diagnose the t-stat but per rules I can't explain.

  10. #10
    Join Date
    Jul 2008
    Posts
    26
    it is a simple 2 wire t-stat...I have even disconnected both of the wires, one at a time, and it just keeps on running

  11. #11
    Join Date
    Jun 2008
    Location
    west point, ga.
    Posts
    328
    O.k. it is in your controls in your furnace.Call a tech.

  12. #12
    Join Date
    Jul 2008
    Posts
    26
    that is why I came on here...I just recently graduated HVAC school and I am all certified...but still can't figure this one out...never ran across this kind of problem

  13. #13
    Join Date
    Jun 2008
    Location
    west point, ga.
    Posts
    328
    Get 15 post and apply for pro status.

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