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-   -   Thermostat Has a Blank screen after installing. (https://www.askmehelpdesk.com/showthread.php?t=635838)

  • Feb 13, 2012, 09:00 PM
    sharper11
    Thermostat Has a Blank screen after installing.
    I am installing a LUX TX9600TS thermostat from a TRANE BAYSTAT239A. The thermostat has Aux/Emergency Heat. I have followed the directions to the best of my ability.

    The LUX has optional batteries, I install them, and it turns on before I push it into the base. After pushing it into the base, the thermostat display goes blank. If I move the ON/AUTO switch to ON, the air turns on, but still no display.

    Here is my current wiring:

    G -> G
    B -> told not to hook it in
    O -> O
    Y -> Y
    RC -> R
    RH -> Jumped to RC
    W2 -> W
    A -> n/a
    W1 -> Jumped to Y
    C -> B (from the B & O option, told B is common wire)

    This is what I have. I also have a Brown Wire that was not in use in the old thermostat.

    I am not sure what I am doing wrong. Any help is greatly appreciated.
  • Feb 13, 2012, 09:16 PM
    sharper11
    I want to just post this for humility, but maybe also to help someone else.

    The RED wire, was not pushed as far in as possible. I pushed it in as far as it could go, and tightened it the best I could... it now works. Simple fix, but frustrating.

  • Feb 14, 2012, 06:56 AM
    wmproop
    Did you turn off thr power to the furnace before you started the changeout?

    If not you might have a fuse in the furnace circuit board blown, or you could have fried the transfoemer
    ,, check these 2 out and let us know, if there's no low voltage (24 to 28 volts) the tstat can`t work
  • Feb 14, 2012, 06:57 AM
    wmproop
    Good for you
  • Feb 14, 2012, 07:25 AM
    sharper11
    Thanks wmproop. I made sure that the circuit breaker for the Heat was turned off anytime I messed around with the wiring. I had a few trips back and forth.

    My biggest issue was the "B" "X2" and "W" wire. I did some Google searches to see if other had any similar issues. In the end, for my Old-to-New thermostat, The "B" is the Common Wire, the X2 was not used, and the "W" was put in the W2 slot - jumped with a wire to W1. ---

    QUICK QUESTION for you: Our old thermostat (which was analog (?), not digital) was always kept at 65 degrees. It run a lot, and the temp in the house would be around 70 and comfortable. The Digital stat reads "70" and I have it set at 68.. it is very cold. So the question is, Is that normal? -- I was wondering if the Temp was wrong. . Or if the old thermostat was just.. "that bad".

  • Feb 14, 2012, 08:36 AM
    wmproop
    Probably the old tstat was just that much out of calibration

    Did you double check to make sure the blue wire (common) was connected in the furnace?
  • Feb 14, 2012, 08:44 AM
    sharper11
    I did not check, I will when I get home. I asked around to people I work with (They made a switch to digital a few years ago). And they said they had similar issues, but that the digital tstat was just very accurate (+/- 1 degree).. .

    We'll see how it wors out, but I will double check the blue wire.

  • Feb 14, 2012, 02:54 PM
    dewey066
    It says in your original post that you have W1 jumped to Y... is that correct? The W1 and W2 turn on your heat (1 is stage 1, 2 is stage 2). The Y-wire turns on the outside condenser. You probably don't want to run the heat and air conditioning at the same time.
  • Feb 15, 2012, 05:18 AM
    sharper11
    Thnaks for the reply dewey. -- I have a 2-Heat / 1-Cool. Heat Pump System with Aux and Emergency Heat. The wiring diagram shows "Y" as -"Heat Pump" jumped to "W-1." and "W" going to "W-2" - "Aux/Emerg. Heat".
  • Feb 15, 2012, 06:27 AM
    wmproop
    I didn`t notice before,but the w1 shouldn`t be jumpered to y, as the man said this will cause heat and ac will run at the same time,, although this won`t have anything to do with system not running at all
  • Feb 15, 2012, 07:31 AM
    sharper11
    WMProop & Dewey, can I ask you a favor (again): read the following and tell me if this makes sense to you and double check my wiring set up above. I do not want to get this wrong:

    Quote:

    Do not connect wires to both O and B. Connect the reversing valve wire to O or B, just as the previous thermostat. Connect 24 VAC wire to RH and leave in the factory supplied jumper wire between RH and RC. Connect compressor wire to Y and fan wire to G. It is not necessary to wire the X, E or X2 terminal. Connect W or W2 to the W2 terminal and add a jumper wire from W1 to Y. If you have a C (common wire) connect it to the C terminal. Move dip switch #1 located on the back of the thermostat to the ON position. Set the GAS/ELECTRIC switch on the back of the thermostat to the ELECTRIC position. Once both of these changes have been made be sure to press the HW_RST button.
  • Feb 15, 2012, 07:37 AM
    sharper11
    Here is the wiring diagram supplied by the company LUX
    http://i198.photobucket.com/albums/a..._WebManual.jpg
  • Feb 15, 2012, 08:41 AM
    wmproop
    OK, looking at the diagramm I`m thinking with nothing from the furnace or heatpump going to W1,that jumper doesn`t matter,, you might want to look at the programing instructions do the programing before you push it into base, if you are wired exactly as diagram states, and the programs ( is it a programmable tstat?) are done,, are you sure you have 24v coming from the furnace, to the tstat. If all this checks out I`m thinking although its new, you could have a bad tstat. It happens

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