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    mkennedy109's Avatar
    mkennedy109 Posts: 3, Reputation: 1
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    #1

    Jun 13, 2008, 07:13 AM
    New Programmable Thermostat Blowing Hot Air
    New Programmable Thermostat Blowing Hot Air

    Last night I (my boyfriend) installed a new Honeywell Programmable Thermostat (RTH6300B). We gave it a while to cool down but after a few hours set at 72, it was still 84 deg in my house. My unit is in the attic, so I went up to listen- the fan is blowing (warm air) and it seems like 'something' is trying to start-up. It is no longer dripping condensation- no surprise since its not cooling.

    A few things I noticed (but I know nothing) are:
    1) There was no Yellow wire. I have RC, W, & G wires- which were labeled as such on the Thermostat. But I've been reading some posts and wondering if the lack of a yellow wire is a problem.

    2) This is a Heat/Cool 5-2 day Digital Thermostat but my system is for Central Cooling only; I have gas/hot water/radiator heat on a separate thermostat.

    Before we replaced it, I had an older round cool-off-heat/fan-auto-on/mercury tube thermostat; but just for the cooling system. It would continue to run after it reached the desired temp & sometimes the fan would run unnecessarily, but at least it was cooling the house down.

    It's consistently 90 degrees lately & my allergies are horrendous with the windows open so... Please Help!

    -M
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Jun 13, 2008, 10:08 AM
    Usually the yellow is used to activate the A/C.
    Check the fuses on the outside unit.
    mkennedy109's Avatar
    mkennedy109 Posts: 3, Reputation: 1
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    #3

    Jun 13, 2008, 10:30 AM
    But there is no yellow wire and the A/C was working before we switched the Thermostat..?
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
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    #4

    Jun 13, 2008, 02:33 PM
    What was the model number and brand of the
    Old thermostat?
    T-Top's Avatar
    T-Top Posts: 1,871, Reputation: 100
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    #5

    Jun 13, 2008, 07:35 PM
    If you used heat with the same thermostat with out switching a switch on the furnace, its impossible that the thermostat did heat and cool with the info you gave.
    mkennedy109's Avatar
    mkennedy109 Posts: 3, Reputation: 1
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    #6

    Jun 14, 2008, 05:22 PM
    We connected the White W wire to the Y and all is working well. Think it was labeled incorrectly before. Thanks to everyone for your help.

    -M
    wmproop's Avatar
    wmproop Posts: 3,749, Reputation: 91
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    #7

    Jun 14, 2008, 07:05 PM
    Come heating season,, you`ll probably have the same problem again,, hope not
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
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    #8

    Jun 14, 2008, 11:19 PM
    wmproop. I feel the same way. Something is wrong with this picture.
    WallyHelps's Avatar
    WallyHelps Posts: 1,018, Reputation: 136
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    #9

    Jun 15, 2008, 08:16 AM
    Quote Originally Posted by wmproop
    come heating season,,,,,you`ll probably have the same problem again,,,,hope not
    Note she said she has a separate heating system on a different thermostat. Maybe it will be okay after all.
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #10

    Jun 15, 2008, 09:50 AM
    It could be but you should always follow the wiring code OR reidentify the wire for the next person so this problem will not present itself again.
    WallyHelps's Avatar
    WallyHelps Posts: 1,018, Reputation: 136
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    #11

    Jun 15, 2008, 02:54 PM
    Quote Originally Posted by hvac1000
    It could be but you should always follow the wiring code OR reidentify the wire for the next person so this problem will not present itself again.
    I totally agree with this! Especially since the next guy may still be YOU!

    Good practice would be to note which wire goes where on the old thermostat before removing it.
    I've been known to overlook this simple thing myself. :o
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