Question about Honeywell CT87B ROUND HEATING&COOLING MECHANICAL THERMOSTAT - WHITE Heater

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Honeywell RTH 7500d is not working.

I have a honeywell RTH 7500d. All the wires are installed per the install guide. Red to R, with jumper to Rc; blue to C; orange to O; yellow to Y; green to G, and white to W2/Aux, with jumper to E. Once I plug the t-stat back in, I can't get any cooling, heating, or even the fan on. I've gone through and set all the settings, and still nothing. Thanks!

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  • cfarmer60 Apr 30, 2010

    heatman101, thanks for the response. I did that last night with the volt meter, and it measured nothing. I think I created the problem earlier. I tried to install a honeywell rth6400 tstat, which I later found out was not compatible with my system since I have aux. heat. Turns out, I wrapped the O, B, and W wires together and put them into the O/B terminal. That may have blown it.



    The power was off when I did the hookups, so it must have blown it when I flipped the breaker back on.



    Now I think I need a transformer, and that is over my head.



    Thanks again.

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  • Honeywell Master
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Hi,
If nothing is happening then I am wondering about tje power... If you have access to a digital meter, you should have 24v a/c across the R wire and the C wire...
Did you make sure to turn off the power at the air handler or furnace before unhooking the wires at the t-stat??? If not then you have blow a fuse in the control board or burnt out the transformer...

If you have power on R then jumper to G and the fan shoudl come on... if it does then the t-stat is bad...

This should give you a few things to try and is what I would be doing if it were my service call...

heatman101

Posted on Apr 29, 2010

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