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  1. #1
    Join Date
    Jan 2008
    Posts
    4

    Default Digital thermostat problem

    Woke up this morning to a freezing house. Digital thermostat said only "battery". We replaced the three AA batteries and reset the date and times but heater will not kick on. The air conditioner works as it will kick on and then shut off realizing it's already cold. Digital unit mfg: White Rogers and is about 10yrs old. Can't locate the manuel at moment. Any suggestions before we call for help?

  2. #2
    Join Date
    Aug 2007
    Location
    Denver, CO
    Posts
    666

    Default Re: Digital thermostat problem

    Look at where the stat wires are connected to the stat. There should be an R and a W or W1.

    Jumper those two out or put them under the same terminal and your heat should kick on if it is a problem with the stat. Also make sure the stat is set to heat and not cool if there is a selector switch.

  3. #3
    Join Date
    Aug 2007
    Location
    Maryland
    Posts
    1,580

    Default Re: Digital thermostat problem

    Try taking off the t-stat like you would when you change the batteries & re-install it making sure no contacts were bent & that they all seem to be making proper contact

  4. #4
    Join Date
    Aug 2007
    Location
    The Great White North
    Posts
    4,045

    Default Re: Digital thermostat problem

    I'm thinking the program has been set for the default... so all previous set point temperatures were lost.

    Before taking it apart and jumping wires it should be able to turn the heat on through manual override on the thermostat.... by adjusting it upward.

    The mention of A/C working also comes to mind making sure the mode switch is in "heat" mode.

    Just 2 cents worth.

  5. #5

    Default Re: Digital thermostat problem

    When you see battery on some models it means power is off and the stat is using a battery.check breaker also check the power switch on the furnace. have you been near the unit and mistakenly turned off the unit. Or the contacts may be dirty remove the stat power off and gently sc**** the contacts with a small knife.

  6. #6
    Join Date
    Jan 2008
    Posts
    61

    Default Re: Digital thermostat problem

    if your white rogers digital programmable thermostat was displaying battery constant not flashing it was likely not low battery but a loss of power or a power spike on the control circuit. if you have a humidifier that is also controlled with this (E2/P switch) it could also be at the humidifier circuit.
    each thermostat has its own reset sequence, if the button combination doesn't work you'll need to use the override reset (some are accessible while in place - some needing a wire or bent paperclip to reset, some you have to remove the face unit to access the total reset). after resetting you'll have to re-enter the time (may have to also re-enter date). make sure you are using correct time (am/pm or set for 24-hour clock). test by using manual override one degree at a time, waiting for a click after each degree you set manual.

    since the thermostat is operating the fan and a/c just fine your furnace might be locked out, do they (furnace and a/c) share the same air handler? since you didn't mention a return of a display of battery or having to reset the clock again after trying to call for heat perhaps not a voltage spike from a relay. you should also discharge the face part of the unit (take off as though replacing batteries then touch it to something to discharge static electricity, reset and reinstall).

    as suggested check for a on/off switch near the furnace, make sure it is in the on position, then check your circuit breaker box, locate the circuit breaker for the furnace system and cycle it off completely then on then off again leave it off for at least five minutes then back on, now return to the thermostat and see if it will properly call for a heat cycle then watch and listen at your furance and see if all operates as expected.

    next thing to check would be if any activity at the furance location may have disconnected one of the control wires that is only for the furnace side of thermostat. be especially careful where the transformer is (if it is low voltage) and don't touch anything you don't understand (spark igniters or glow rods for example). if you're unsure at all call your HVAC company or oil company (if oil furnace).

    if you have 220 baseboard heat, cable heat, electric furnace or something other than a fuel fired furnace (low voltage thermostat) then you might have another issue (usually a remote sensor) call your HVAC company or an electrician. if you have a ptac you need to call a professional. if your "heater" is a heat pump those thermostats have a few more trouble shooting steps.

    if you have fuel-fired furnace it might be a CO sensor or draft sensor is locking out, perhaps you have a problem with the furnace itself. if this followed an especially cold and windy night there may have been a safety condition with the furnace. if you do have a fuel fired furnace you really should have fresh battery back-up CO detectors in place. when in doubt call a professional. if you had a power outage last night and when power was restored you had a bit of a spike it might have effected and locked out your thermostat (and what was left of the batteries was used up in the meanwhile), the total manual override reset and discharge should correct the problem if it is isolated to the thermostat itself.

    find your manual, guides and FAQs here

    http://www.white-rodgers.com/wrdhom/...Home_index.htm

  7. #7
    Join Date
    Jan 2008
    Posts
    4

    Question Re: Digital thermostat problem

    First, let me erase a confusion. There is a toggle switch between a/c and heat. Naturally, you switch to a/c to check and see if that works, and it does, as well as just the fan. But the switch was not on a/c it was on heat when this problem occured. My stat is on a timer, heat kicks 4am, heat did not kick on. Showed a solid battery word at bottom of lcd. We have done as suggested, wait 5 min put new batteries, de-static, breaker switch off for 5 min etc.. still not working. Someone suggested touching R and W wire. We have a RC W RH in that order. RC is a fat red wire that connects at RH with a skinny red wire. Skinny red wire is the one that goes through the wall. Fat red wire is a surface wire on top of circuit board. Which of those red wires do we touch to overide the stat. Husband thinks the furnace is the prob. You guys are all great what do you think?

  8. #8
    Join Date
    Aug 2007
    Location
    The Great White North
    Posts
    4,045

    Default Re: Digital thermostat problem

    It could very well be the furnace itself having a problem and gone into lock out.



    If you go the White-Rodgers web-site and select the model of thermostat you have and look up the wiring diagram.

  9. #9
    Join Date
    Jan 2008
    Posts
    4

    Smile Re: Digital thermostat problem

    OK. Found a reset button in an obscure place in the furnace and wa la now it works!. Have had this furnace for 20 years and never had a problem until now. Reset button was higher then eye level and attached to two orange wires.

    Thank you all for your help.

  10. #10
    Join Date
    Nov 2007
    Location
    Sand Springs, OK
    Posts
    467

    Default Re: Digital thermostat problem

    I'm glad to hear you're warm again.
    Debby in Oklahoma

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