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Thread: Trane troubles

  1. #1
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    Trane troubles

    Any service facts for:
    YCH181E3LBBB
    114510138D

    I have 24 volts between c&g, but no indoor blower coming on. LED on steady indicating no problems. Before I condemn the board i want to verify that nothing else but the board could be causing the blower to not operate.
    Last edited by ncboston; 02-17-2012 at 05:25 PM. Reason: Sorry. Meant to start new thread.

  2. #2
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    U got voltage at blower motor

  3. #3
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    Thread Starter
    No 24 volts at contactor. Wondering if board is bad and k6 relay not closing or if the board might not be passing lv for a different reason. But to answer your question, there is high voltage present at the contactor.
    I'm pretty sure it's a bad board, but I want to make sure nothing else could be telling the board to not pass 24 volts to the contactor.

  4. #4
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    Thread Starter
    To the mods,
    thanks for moving.

  5. #5
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    make sure phase is right,they have monitors on them.
    work to live not live to work.

  6. #6
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    The kicker is, this thing was running. I opened the disconnect, replaced filters, closed disconnect, and no blower. No wires moved, nothing.

  7. #7
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    Quote Originally Posted by ncboston View Post
    The kicker is, this thing was running. I opened the disconnect, replaced filters, closed disconnect, and no blower. No wires moved, nothing.
    Sabotage, you broke it !!

  8. #8
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    Tied into a Trane EMS by chance?

  9. #9
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    Thread Starter
    Quote Originally Posted by Chris_Worthington View Post
    Sabotage, you broke it !!
    I'm in trouble now.

  10. #10
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    I ran into this type of problem just 3 weeks ago on a Trane unit. Does the unit have an economizer?

  11. #11
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    smoke detector???????????

  12. #12
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    Thread Starter
    Quote Originally Posted by Jerry Jessup View Post
    I ran into this type of problem just 3 weeks ago on a Trane unit. Does the unit have an economizer?
    Yes.

  13. #13
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    Quote Originally Posted by supertek65 View Post
    smoke detector???????????
    No fire alarm system or smoke detector tied in.

    24 volts enters rtrm board, but does not bring on IDB.
    I'm thinking either board is bad, or something that the board looks at is bad.

  14. #14
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    is this a model that you can put your meter across a couple terminals and determine which mode the unit is in and if there are any alarms?
    the only things that would usually keep a blower off is smoke, freeze or un occupied setting?

  15. #15
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    Thread Starter
    no. I have 24 volts across g & c coming into the rtrm board.

  16. #16
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    looks like you have it figured out already?
    I will read some IOM stuff and look through the reliatel book!

  17. #17
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    The Trane unit I was working on had the same symptom. I also thought it was the main control board at first, but after some reading I found that I had a faulty economizer board. I purchased a new economizer board and unit quickly come online.

  18. #18
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    One way to test is to turn off the unit, unplug the economizer board plug from the main control board and then turn the units disconnect back on. If the blower comes on then replace the economizer board. The board costed us $$$$
    Last edited by Chris_Worthington; 02-18-2012 at 07:14 AM. Reason: Pricing Removed

  19. #19
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    The boards usualy have triacs (electronic switches) for the output relays. Can you remove the output wires at the RTM going to the fan output and see if you have 24 volts. If you have 24 volts at the board and lose the 24 volt when you put the wires back on, the triac is bad and you have to replace the board. Can this unit be viewed with Rover software and do you have Rover? As someone said earlier, the economizer or the connections may have a problem. If you still have the bypass plug for the economizer, you can try plugging that in and see if the fan starts.

    Good luck

  20. #20
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    If the unit runs in TEST (including blower) the main board is good.

    In that case, it will be the econ board.
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