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  1. #1

    York RTU stays stuck in heating...

    Even when w1 is diconnected, 24v power is at w1 terminal. I replaced board, tested by jumping heat on and off. Problem solved. No, got a call that unit won't come out of heat again..any suggestions??

  2. #2
    Join Date
    Feb 2009
    Location
    Miami, Florida
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    6
    That should be the only possible reason of having 24 VAC out of the heat output, main board have to be shorted out.

  3. #3
    possible control wire rubbing a 24v line? its a long shot but worth checking if you have changed the board

  4. #4
    Join Date
    Jul 2005
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    5,491
    What's the model# of the unit?

  5. #5
    Join Date
    Dec 2012
    Location
    Illinois
    Posts
    311
    Heat circuit load too high? (Bad ignition module, partially shorted valve) Excess load welded relay on new board?

    That's my two cents. Good luck, definitely odd sounding issue though.

  6. #6
    Join Date
    Oct 2011
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    Chicagoland Area
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    Is it a sunline unit. If it is, I know whats wrong. Are you a tech? You need to check your low voltage circuit. In my experience runaway heat on the sunlines is only caused by 1 thing.
    Officially, Down for the count

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  7. #7
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    Oct 2011
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    I'll even give you a hint: Something is welded shut. If it's a tan unit it's one thing, and if it's the newer brown units it's another.
    Last edited by 2sac; 01-09-2013 at 11:07 PM.
    Officially, Down for the count

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  8. #8
    Join Date
    Nov 2006
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    Quote Originally Posted by 2sac View Post
    I'll even give you a hint: Something is welded shut. If it's a tan unit it's one thing, and if it's the newer brown units it's another.
    You are SUCH a tease!
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  9. #9
    Join Date
    Oct 2011
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    Quote Originally Posted by timebuilder View Post
    You are SUCH a tease!
    I am, aren't I
    Officially, Down for the count

    YOU HAVE TO GET OFF YOUR ASS TO GET ON YOUR FEET

    I know enough to know, I don't know enough
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  10. #10
    Yea I am a tech. Tan D4CG series

  11. #11
    Join Date
    Oct 2011
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    I'm not going to make it easy on you. LOL Look at the heating circuit in your schematic. There is a 3 wire switch whose contacts are welded closed on both sets of contacts. If you follow the schematic, you will see why you have runaway heat. When you replace this you need to order the replacement kit from York, not just the part.
    Officially, Down for the count

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  12. #12
    Join Date
    Nov 2004
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    Quote Originally Posted by canmex View Post
    Even when w1 is diconnected, 24v power is at w1 terminal. I replaced board, tested by jumping heat on and off. Problem solved. No, got a call that unit won't come out of heat again..any suggestions??
    there are 3 ice cube relays, replace the one in the middle.

  13. #13
    Join Date
    Oct 2011
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    Quote Originally Posted by valdelocc View Post
    there are 3 ice cube relays, replace the one in the middle.
    Not on the tan units
    Officially, Down for the count

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