Ask Experts Questions for FREE Help !
Ask
    krbowers's Avatar
    krbowers Posts: 3, Reputation: 1
    New Member
    		  
    #1

    Jan 13, 2010, 08:17 PM
    How do I jumper a TX500B Thermostat, bypass the therm. To see if it's working?
    I hear the thermastat click when I raise the setpoint above the measured temp, but nothing happens. I want to jumper out the therm. just to eliminate it as the problem.
    From left to right - I have G, Y, W, RH & RC - there is a jumper from RH to RC, with a red wire connected. I do read 28 VAC from R to W
    KISS's Avatar
    KISS Posts: 12,510, Reputation: 839
    Uber Member
    		  
    #2

    Jan 13, 2010, 08:23 PM

    Call the jumped Rh/Rc connection R

    R to G turns on inside fan only
    R to Y turns on outdoor unit only

    R to W; turns on heat; furnace controls the fan if oil or gas heat.

    If you measure 28 V from R to W on a call for heat, then the thermostat is not working.
    krbowers's Avatar
    krbowers Posts: 3, Reputation: 1
    New Member
    		  
    #3

    Jan 13, 2010, 08:51 PM
    Quote Originally Posted by KeepItSimpleStupid View Post
    Call the jumped Rh/Rc connection R

    R to G turns on inside fan only
    R to Y turns on outdoor unit only

    R to W; turns on heat; furnace controls the fan if oil or gas heat.

    If you measure 28 V from R to W on a call for heat, then the thermostat is not working.
    No voltage R to W on call for heat and jumpering R to W does nothing - thermostat is OK?
    KISS's Avatar
    KISS Posts: 12,510, Reputation: 839
    Uber Member
    		  
    #4

    Jan 13, 2010, 08:58 PM

    Right. On call for heat the voltage would be 0; On a no call for heat 28V or so.

    Thermostat is OK.

    What about R to G?

    Try to do the R to W at the furnace and watch what happens.

    Ignitor, pilot, burner, fan

    Any codes set?

    Unless the furnace has a standing pilot and limit controls.
    krbowers's Avatar
    krbowers Posts: 3, Reputation: 1
    New Member
    		  
    #5

    Jan 13, 2010, 09:28 PM
    Quote Originally Posted by KeepItSimpleStupid View Post
    Right. On call for heat the voltage would be 0; On a no call for heat 28V or so.

    Thermostat is OK.

    What about R to G?

    Try to do the R to W at the furnace and watch what happens.

    Ignitor, pilot, burner, fan

    Any codes set?

    Unless the furnace has a standing pilot and limit controls.
    I'm not sure I know enough to go any farther. I have a furnace in my attic - I took the covers off it and jumpered R to W - it came on. But I think that may just be the furnace for my upstairs, which works. I appreciate your help, but I'll probably have to call a repairman tomorrow.
    KISS's Avatar
    KISS Posts: 12,510, Reputation: 839
    Uber Member
    		  
    #6

    Jan 13, 2010, 10:03 PM

    OK, report back.
    builderbob1's Avatar
    builderbob1 Posts: 41, Reputation: 2
    Junior Member
    		  
    #7

    Jan 14, 2010, 12:34 AM

    If you jump out or connect red and white wire at thermostat and the furnace comes on the thermostat is bad . Turn your thermostat fan control on your thermostatto the on position for a constand fan, if it runs you have 24 volts. If not check your breaker or toggle switch on side of furnace it maybe bad. If no 24 volts check circuit board or transformer
Not your question? Ask your question View similar questions
 

Question Tools Search this Question
Search this Question:

Advanced Search

Add your answer here.


Check out some similar questions!

Reading Therm O Disc Thermostat Numbers [ 1 Answers ]

I Need to know the specs on a therm o disc component from a Microwave (Whirlpool GH7145XFT-1) This is the thermostat or thermal cut-off located on top of the stirrer motor. It was fried so I only have a section of the numbers: 560904 L125C S0145 . I do believe that the L125C mean the thermostat...

Who knows a/c to therm [ 1 Answers ]

Im trying to wire a honeywell th321 to a trane XL 13c, I need the correct wiring diagram or codes. Somebody HELP

Honeywell thermostat pro 8000, Why remove jumper wire? [ 2 Answers ]

I'm trying to install a HoneyWell digital thermostat Pro 8000, part number TH8320U108 for my Rudd and Rheem heating and a/c system. The Rudd Furnace is a plain Silhouette and the Rheem a/c is a model 3765SA17. All of the wiring hook up points from the old Honeywell thermostat match the new...

Noma 5+1+1 thermostat - jumper? [ 1 Answers ]

I just purchased a Noma 5+1+1 heating/cooling programmable thermostat to replace the one that came with my new home. I have a furnace and an A/C unit. The wiring on the old one is as follows: Green wire > G Orange wire > Y White wire > W Red wire > RC jumped to RH The new thermostat has...

View more questions Search