Lennox Problems 3 ton roof top

[Ashlexall]

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????.

[heatingman]

Does it work in test mode?

[Ashlexall]

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.

[kenadiens]

could it be that Y1 is your econo and your comp isn't getting the call on Y2?

[Ashlexall]

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 .

[Jpaulsmith]

I would say it is the board. If your getting voltage in and nothing out the board seems to be fried.

[hvac wiz 79]

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?

[hvac wiz 79]

what makes you "think" a relay is fried? test it to know for sure.

[hvac wiz 79]

I would say it is the board. If your getting voltage in and nothing out the board seems to be fried.

wrong

[Ashlexall]

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.

[Jpaulsmith]

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.

[rednecktech]

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

[slctech]

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.