Question about Heating & Cooling

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I have a Fast HVAC part # TS21 thermostat.I hooked it up,my furnace has two wires, Red and White.I hooked them to W2(white) and RH(red).I programmed the thermostat and now all that happens is my fan comes on and then off every few seconds.Any help out there? My furnace is a natural gas Rheem Criterion II.Thanks

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  • Randy Orndorff Mar 12, 2011

    It's a single stage.I'm replacing the thermostat that was there it was a lux and it was hooked up to the W and RH terminals.My new thermostat is a Fast HVAC part # TS21 thermostat. across the bottom it has the following terminals: I2, I1, RC, DH, H, C Y2, RH, OBW, W2, G, Y1 (W2 FIRST STAGE FURNACE) WHITE WIRE -- (RH 24v) RED WIRE, IS HOW I HAVE IT HOOKED UP.

  • Randy Orndorff Mar 12, 2011

    No,there was only the White and Red wires. On the Lux 500 the one I took off the wire hook up is labeled G,Y,W,RH,RC there is a short black wire going from RH to RC.

  • Randy Orndorff Mar 12, 2011

    I'm not sure.It's doesn't sound like it's trying to spool up like the blower.There is an important notice in the back of the manual.

    When using this thermostat with a gas furnace a common wire C must be connected.
    When working without a common wire:
    A confirm in heat mode the cooling does not switch on or B confirm in cooling mode the heat does not switch on.

    If test A or B fail or the thermostat shuts down in either heat or cool mode then it is necessary to connect a common wire(C),alternately it may be possible to solve this issue by simply connecting the 250 ohm 10 watt resister between C and Y1 at the HVAC equipment

  • Randy Orndorff Mar 12, 2011

    Ok how do I do that? Coming out of the wall is just the two wires.

  • Randy Orndorff Mar 12, 2011

    I have the TS21 Manual here too. Is there a certain page I should look at?

  • Randy Orndorff Mar 12, 2011

    Maybe I should just go get another of the same thermostat I had and use it.I tried to to go fancy might have been a mistake.Thanks

  • Randy Orndorff Mar 12, 2011

    When I do this does the furnace just continue to heat until the wire are disconnected?(if nothing is wrong)

  • Randy Orndorff Mar 12, 2011

    Ok,I will give this a try and post what happens.Thanks

  • Randy Orndorff Mar 12, 2011

    Ok,I hooked the wires together turned the pwr on and the OK led blinked once stayed on,the power led stayed on the whole time..A fan ran for about 30 sec. then the furnace tried to light, it flamed on for 3 to 5 seconds went out, so did the gas led and the blower started running.

    For about 3-5 days before the furnace would run fine all day and then would do the above for a few hours but sometime during the night it would work fine a heat the house.

  • Randy Orndorff Mar 12, 2011

    OK,I will try that and hopefully it will work.I will let you know.Thanks again

  • Randy Orndorff Mar 12, 2011

    OK,I did that ,powered on and it is working like it is suppose to.Thank you very much for your expertize.

  • Randy Orndorff Mar 12, 2011

    The solution fixed my problem.

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Hi, this may be a problem with the furnace itself. Have you tried connecting the red and white wires directly (without the thermostat)? The furnace should light when you do this. If it doesn't, it will probably blink trouble codes to be diagnosed. Please let me know if you have any questions, and thanks for using FixYa.

Posted on Mar 12, 2011

  • Jeff Turcotte
    Jeff Turcotte Mar 12, 2011

    yes, when the wires are connected, it's the same as if the thermostat is turned up to 150 degrees--it will not shut off. I do not recommend leaving it like this. This was only to test the furnace.

  • Jeff Turcotte
    Jeff Turcotte Mar 12, 2011

    OK, I think you have a problem with the flame sensor. It's a little thin cylinder that sits in front of the burner flame. If you can get some steel wool on it, scrub it real good (with thermostat wires unhooked). If you can't clean it well on the furnace, take it off and clean it. It's held on a by a couple of screws and has a cable connected. Put it back and make sure it's sitting right in front of the flame. Hook up your thermostat as you had it originally and you should be good for at least a year or 2. If the sensor is getting oxidized too fast and acts up again, replace it with new.

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Hello, is this a 2 stage furnace? there should be just a W terminal and a RH where the wires hook up too if it's a single stage unit.

Posted on Mar 12, 2011

  • 4 more comments 
  • Robert Mar 12, 2011

    Do you have a common wire hooked up to C terminal?

  • Robert Mar 12, 2011

    Which fan keeps turning on and off the inducer or blower motor?

  • Robert Mar 12, 2011

    ok that is a jumper wire u have there, if this tstat is just used for heating the jumper should be removed.

  • Robert Mar 12, 2011

    So this is heating only and single stage, which motor is running on and off the inducer or blower motor?

  • Robert Mar 12, 2011

    I have the manual in front of me and a common wire should be hooked up,this thermostat is a little tricky to hook up, but if you add the common wire you should be ok.

  • Robert Mar 12, 2011

    You will have to run new tstat wire from the board on the furnace to the tstat on the wall, you will need 3 conductor tstat wire. you can use fish tape to guide it through the wall. I know it kinda sucks to do all this work but without that common wire the tstat wont work.

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