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  1. #1
    Join Date
    Apr 2012
    Posts
    12

    Lennox Problems 3 ton roof top

    Just wondering if anyone could help me out. I don't know if it is dealing with my public school system today or what i am just mind dumb. I have a M# LCA036H2BB1G Lennox roof top that another contractor tried to repair by using a 17 year old and a phone. Once they found out i had been called they cut alot of wires. I replaced all the wires and have another problem. I can get the board lights to light for fan and cool 1, but nothing comes on. I check on the far right of the board were the 24v comes in to the board and the power is there but if i check the third wire over which goes to the comp. contactor there is nothing. I believe the board is fried, although I've never seen a board go through its processes and when i press and hold the reset button the compressor will come on for a second. I had one wire that was of that was not on any schematic. It was added as a feature and it looks as if it went to the economizer. It needed 24v to operate so i stuck it on the 24v terminal. does any one have a comment it would be greatly appreciated. The original problem was blown fusses and a trans????.

  2. #2
    Join Date
    Dec 2004
    Location
    Chicago area
    Posts
    1,453
    Does it work in test mode?

  3. #3
    Join Date
    Apr 2012
    Posts
    12
    Nope, and it seems that you can not clear the codes unless their was been many errors. I reset codes for about 5 min. and it seemed to be mostly the same. E01 H10 H11 mostly pertaining to loss of power.

  4. #4
    Join Date
    Feb 2012
    Location
    B.C. Canada
    Posts
    44
    could it be that Y1 is your econo and your comp isn't getting the call on Y2?

  5. #5
    Join Date
    Apr 2012
    Posts
    12
    Could be, I have been taking care of this unit for two years along with this group of thugs. It has been running fine until some type of power failure. I personally think one of the relays on the board is fried. What do you think. I normally do not leave a unit down but since they have another I have to take care of some other things but I will be going back this afternoon .

  6. #6
    Join Date
    Apr 2012
    Location
    lexington, NC
    Posts
    32
    I would say it is the board. If your getting voltage in and nothing out the board seems to be fried.

  7. #7
    Join Date
    Feb 2006
    Location
    USA
    Posts
    4,381
    H10 & H11 are the heat test. I don't recall an E01 but know of S01 ... errors are numbers stored 1 through like 110 or so. what's the OD temp? OAD suitable LED illuminated?

  8. #8
    Join Date
    Feb 2006
    Location
    USA
    Posts
    4,381
    what makes you "think" a relay is fried? test it to know for sure.

  9. #9
    Join Date
    Feb 2006
    Location
    USA
    Posts
    4,381
    Quote Originally Posted by Jpaulsmith View Post
    I would say it is the board. If your getting voltage in and nothing out the board seems to be fried.
    wrong

  10. #10
    Join Date
    Apr 2012
    Posts
    12
    Quote Originally Posted by hvac wiz 79 View Post
    H10 & H11 are the heat test. I don't recall an E01 but know of S01 ... errors are numbers stored 1 through like 110 or so. what's the OD temp? OAD suitable LED illuminated?
    I am assuming it is an e for error all I get is the bottom light on the code and it is a c. Thinking it is the bottom of a digital E. Od is about 75 room temp is 78f there is another led on on far right but have forgotten what it stands for. I believe it is omg org or something to that effect. The tstat is calling and the unit is lighting up just no function. No fan with tstat fan on no condenser fan when I push comp contactor on. I will be back on site in 3-4 hours and will check more options. I am not feeling to brain dead today.

  11. #11
    Join Date
    Apr 2012
    Location
    lexington, NC
    Posts
    32
    Quote Originally Posted by hvac wiz 79 View Post
    wrong
    Assuming he has a call for cooling and getting 24volts from stat to Y1 input and he has checked pressure switches to be sure they are closed and still not getting 24 v to output for compressor contacts I would say its the board.

    I'm assuming he has checked all of the safetys on the board.

  12. #12
    Join Date
    Feb 2002
    Location
    Azle, Texas/ Fort Worth
    Posts
    190
    I had a board on a JCI 10 ton acting all crazy and giving loss of power due to C1 wouldnt start but what i found was FS was bad . never gave that code ,just never closed contactor to C1 and then error of loss power
    An air conditioning or refrigeration unit never signs a check for me! PEOPLE do that,and you should never allow yourself to forget that WE fix the problems of people,not machines.They are at the heart of our business,one way or another,and polishing the skills required to provide solid customer service will never be a waste of your time

  13. #13
    Join Date
    May 2004
    Location
    Salt Lake City/Tooele
    Posts
    2,735
    No such thing as a E01 on a Lennox IMC board. Like you said it is probably a c01 which means the unit is receiving a first stage call for cooling. Need to double check all the dip switch settings and will need to double check ALL the ECTO settings. Have a feeling that company XYZ was in there playing around and screwed up something in the ECTO settings. Older versions of the IMC may snap back to default on a power bump. If that is the case, may be getting a call for heat but the ECTO setting is basing itself on remote sensor and not conventional thermostat. Need a laptop and plug into the thing...SOOOO much easier. Takes special connections, but the LC program is free from Lennox can be downloaded from their commercial site.

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