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    ameriman1's Avatar
    ameriman1 Posts: 4, Reputation: 1
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    #1

    Nov 6, 2009, 08:37 PM
    No power to the stat controller
    I put in a new transformer, and just put in a new board. A couple of days ago I went to shut my heater off and there was no led on the controller. There is still no 24vac getting to r & c where the wires from the thermostat connect. And when I close the door the fan comes on, the only way I can shut it off is to unplug it or leave the door off. I'm just perplexed as to why there is no 24v to the stat. On the board I am getting 24vac to the gas... so...
    KC13's Avatar
    KC13 Posts: 2,556, Reputation: 99
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    #2

    Nov 6, 2009, 09:20 PM
    Start by posting brand/model # of the heater. If blower runs continuously and you are lacking control voltage, this is usually caused by an open limit switch of some type.
    ameriman1's Avatar
    ameriman1 Posts: 4, Reputation: 1
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    #3

    Nov 6, 2009, 10:09 PM
    Quote Originally Posted by KC13 View Post
    Start by posting brand/model # of the heater. If blower runs continuously and you are lacking control voltage, this is usually caused by an open limit switch of some type.
    It's a carrier model 394jaw036065 I am pretty sure it's a limiting switch and am suspecting it's the vsss (vent safety shutof switch) but I don't know where it's at. I was looking at the schematic and it says it's a manual reset
    KC13's Avatar
    KC13 Posts: 2,556, Reputation: 99
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    #4

    Nov 6, 2009, 10:14 PM
    If both schematic and ladder diagrams are present, colors of wires connected to these devices would be indicated. There's your clue. Vent/draft safeguard switches are usually located closer to the flue, inducer, or draft diverter.
    ameriman1's Avatar
    ameriman1 Posts: 4, Reputation: 1
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    #5

    Nov 6, 2009, 10:22 PM
    Quote Originally Posted by KC13 View Post
    If both schematic and ladder diagrams are present, colors of wires connected to these devices would be indicated. There's your clue. Vent/draft safeguard switches are usually located closer to the flue, inducer, or draft diverter.
    Man I looked everywhere... unfortunately the schematic shows the breadboard exterior and interior. I followed the line and there is nothing on it... according the schematic, the vsss is inline on 'R' and looks like has a hook into sec 1... I went out one line and was looking at vsss switches... there is nothing like that on this thing that I can tell.
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    ameriman1 Posts: 4, Reputation: 1
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    #6

    Nov 6, 2009, 10:34 PM

    You, that was it... I found it... geez... should have read more carefully could have saved myself 140.00... well, at least I have new electronics... should last for another 20 years haha...

    Thanks man, that was the trigger I need to get my brain working...
    KC13's Avatar
    KC13 Posts: 2,556, Reputation: 99
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    #7

    Nov 6, 2009, 10:40 PM
    Pass it on... ;)
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