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  1. #14
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    Feb 2005
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    Quote Originally Posted by wreakingHaVAC View Post
    12 flashes - Fan Overload Lockout. Indicates 24vac is not detected on the Fan Over terminal. Not all units have external overloads. If a motor in the unit has an INTERNAL overload, the pins on the board will be jumped .
    Has external overload and the contacts were closed, I jumped out the contacts and still had 12 flashes.

  2. #15
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    Aug 2017
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    Quote Originally Posted by jimp View Post
    Has external overload and the contacts were closed, I jumped out the contacts and still had 12 flashes.
    On all 3 units, or just on one?

  3. #16
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    Thread Starter
    Quote Originally Posted by wreakingHaVAC View Post
    On all 3 units, or just on one?
    All three units.

  4. #17
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    Aug 2017
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    Quote Originally Posted by jimp View Post
    All three units.
    Now that's strange.
    Lightning does usually seem to enjoy eating up boards. It sounds like you already have it figured out. Quote them 3 boards and make some $$$

  5. #18
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    Feb 2005
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    Thread Starter
    Quote Originally Posted by wreakingHaVAC View Post
    Now that's strange.
    Lightning does usually seem to enjoy eating up boards. It sounds like you already have it figured out. Quote them 3 boards and make some $$$
    The lighting also ate the three smoke detector relays. The relays were located in a 4x4 junction boxes away from the detectors, up 20 ft in the air. It took me a while to find them, running around on a high lift.

  6. #19
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    Aug 2017
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    That's crazy. It sounds like you are all over this job... figuratively and literally. Lol

  7. #20
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    Quote Originally Posted by wreakingHaVAC View Post
    That's crazy. It sounds like you are all over this job... figuratively and literally. Lol
    Do you ever have a doubt lingering in your mind that you are missing something?

    I just didn't need this job on Monday. I have three HP chillers that I am descaling thats a nightmare, multiple H/X inside the presses that I need to made sure the descaler flows thru all of them. Then flush with tap water and then flush with distilled to remove all tap water. At that point I fill with distilled and glycol, it takes 2000 gallons of distilled water alone.

  8. #21
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    Aug 2017
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    Quote Originally Posted by jimp View Post
    Do you ever have a doubt lingering in your mind that you are missing something?

    I just didn't need this job on Monday. I have three HP chillers that I am descaling thats a nightmare, multiple H/X inside the presses that I need to made sure the descaler flows thru all of them. Then flush with tap water and then flush with distilled to remove all tap water. At that point I fill with distilled and glycol, it takes 2000 gallons of distilled water alone.
    Sounds like one of those long and tedious jobs, that take longer than it should, due to years of not being maintained properly, but it's a detailed process, that you need to figure out how to do properly. Then suddenly to add to the frustration, you are given another job, that seems like it couldn't possibly be the problem, that 3 of 6 boards all failed in the same manor....

    I second guess myself often, in similar situations. It's usually stress induced. You have to remember the KISS principle in these situations; keep it simple stupid.
    Just stick to the basics of what you found, and try not to wrap your mind around the HOW.
    In the case of faults by lightning, I've seen things that still doesn't make sense... but after replacing the failed boards, everything worked well again.

  9. #22
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    Aug 2017
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    I used to work for a hospital that had a pneumatic tube system. Lightning hit some EMT conduit somewhere on the building, and it ended up frying multiple boards. Some had similar faults, others had different ones. After replacing the boards with issues, the system was good again. It was $66,000 just for the new boards, plus 3 days of labor. The crazy thing is, it could've been prevented with a $40 part. The manufacturer sells a grounding loop protection board, for this reason. So the parts actually cost $66,040.
    Never had a problem since.

  10. #23
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    Replaced all 3 boards, and they fired off. No burn marks any place on the boards.

  11. #24
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    Quote Originally Posted by jimp View Post
    Replaced all 3 boards, and they fired off. No burn marks any place on the boards.
    You had it figured out to begin with. Good work.

  12. #25
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    Nov 2006
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    Southeastern Pa
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    Many times there are no gross damages to electronics. It happens at the bit level.
    [Avatar photo from a Florida training accident. Everyone walked away.]
    2 Tim 3:16-17

    RSES CMS, HVAC Electrical Specialist
    Member, IAEI

    AOP Forum Rules:







  13. #26
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    Feb 2012
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    South Florida
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    Those boards are not very expensive. I wouldn't risk messing around with bypassing anything. If the motors are good and you know it took a surge just get the correct parts. Also get a few spare relays and contractors. I had a Diakin take a surge and had to go through 3 3 pole 40amp contractors 2 dpdt relays a transformer and a board. Had nearly 18 amps on low voltage furnace r the split second before transformer tripped reset...

    I've found in past experience bypassing or doing things to get people up and running brings a lot liability on yourself and your company. Do what you need to do for diagnostic purposes but don't leave the equipment in any position that could get you in trouble. Too many people want something for nothing and your job is more important than them getting a deal.


    Sent from my iPhone using Tapatalk

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