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  1. #1
    A FUN TITLE asmo's Avatar
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    May 2012
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    Douglas County (Parker)
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    Default Need HVAC/Furnace Help - Furnace Dead

    So a few weeks ago I bought a fancy new Ecobee3 thermostat to replace the Honeywell that I had. I hooked it up and everything worked great except the original builder only ran 18-5 between the thermostat and the furnace - so I couldn't hook up the humidifier since I didn't have enough wires (the old Honeywell used a THM5421C EIM to go from 7 wire to 3). So no big deal we went without a humidifier for a few weeks until I could run some 18-10 between the thermostat and the furnace (and humidifier).

    So flash forward to last night. I run some 18-10 between the thermostat and the furnace (no easy task). I hook all the wires up and nothing - furnace wont even power on. I check all my wiring and the safety switch and everything looks good. I test for voltage across C and R at the furnace and I get nothing. I jumper R/W and nothing, I jumper R/G/W and still nothing. I do hear 120AC going into the furnace (hum), but it doesn't translate into anything. I also don't get any lights on the furnace control module.

    Anyone want to help my understand what the hell I am doing wrong. I really hope that the furnace control module didn't puke just because I put some new wires in.

    This is the furnace end before I started:
    Click image for larger version. 

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    This is the furnace end after I replaced the 18-5 with 18-10:
    Click image for larger version. 

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    In both of the above, the top W (going to Y) and the bottom B are going to the safety switch.


    This is the thermostat end (no difference before and after other than different wires -- still the same colors):
    Click image for larger version. 

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    This is the furnace control module (its a RUUD):

    Click image for larger version. 

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    Any thoughts? I really don't want to have to pay for a Sunday emergency call, but I leave tomorrow and need to have heat in the house before I go.
    Last edited by asmo; 02-21-2016 at 13:17.
    What is my joy if all hands, even the unclean, can reach into it? What is my wisdom, if even the fools can dictate to me? What is my freedom, if all creatures, even the botched and impotent, are my masters? What is my life, if I am but to bow, to agree and to obey?
    -- Ayn Rand, Anthem (Chapter 11)

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