carrier infinity help needed, tech's seem to be guessing on issue

[rgs80074]

Hello,

I've had 3 techs looking at my system,  first tech was a joke,  next two at least did diagnostics but unlike what he said after messing with the wiring did not put it back the way it was to start, now part that he said was bad was replaced and not working.  I believe its a wiring issue but other than the ones I had pictures of before they messed with it I am at a loss.

Full system information
Carrier infinity 16 seer system

Air handle/fan coil
model number: FE4ANF003
Product number: FE4ANF003000ABAA
motor control board: CEPL130510-03  HK38EA0112507

Network module (nim)  systxccnim01

Outside unit
Product 25Hca324a00300
2 ton heat pump


system uses the 4 wire abcd format

second tech had never seen the nim network module the third had but hadn't seen one in over a decade,  I have no idea why I needed one but I do remember when installed they could not get the system running/communicating until they went and got that board

quick rundown

replaced blower motor and module as error code said that was the problem.

ran great for a day and then gave the error of motor fault
unplugged everything plugged back in and ran great for 8 hours than gave the code again

per video's tested the volts from board to motor said it should be like 12.5volts on the pins I got less than 4 volts and then board soon stopped working all together.

got second had board off ebay.  seemed to work light up etc but the motor light was not flashing indicating it was not telling the motor to turn on.

I gave up, got certified carrier tech out

he said everything looked to be good, after doing a bunch of diagnosis said he thinks its the blower motor module,

got a second motor/module (now third one in system)  and nothing changed,  he came back out and then decided it was unlikely to have 3 motors/modules in a row bad that it must be the board

got a new board, not second had or used not cheap close to $900

got board in and when I went to install it thats when I noticed wiring was not how it was before hand.
used pictures I had from before hand and got it set up the same way as far as I can tell

but now the network module which is critical is not lighting up as if its not getting power,  this is where I am confused.

module has the outside unit attached to it (assume outside is not truly a communicating unit) those wires was never messed with but there is a green wire that's not attached to anything but it never was attached to the nim unit and its not long enough to attach anywhere else maybe during his diagnostics it used it I don't know.

the other side had two sets of wires going into the abcd

one wire comes from the control board and had every wire going into except for the red wire
the other wise is from the thermostat which also has every wire going into it except for the red wire.
the two red wires from those wires are connected to each other with a wire nut.
on the nim board there is a black wire from the other power port but that was there to begin with.
that black wire goes from the nim board up and splits into two or should say comes from the coils below along with another wire.  the black splits and part of the black wire goes to the nim board and the other end which i do not understand is attached to a red wire that comes from the other wire that comes from the coils and they are held together by wire nut. 

I've posted pictures below hoping something will help.  I just can't believe one part would fail after another i get the feeling the board was not bad but he had changed wires around on his prior visit and never changed them back.  I was not home so I do not know on the last visit if the nim board light up or anything or if he just used the error code and the system not turning on and assumed it was the board.

I have a home inspection coming up next week and time is limited after monday hoping for a hail mary where someone see's or knows something thats not right

Thanks
Ryan

[Porcupinepuffer]

I'm confused as to why there's a NIM board installed. It seems to me it shouldn't be required given how the diagrams for that air handler show the outdoor unit would connect to the non-communicating terminals of the board and you would just have your ABCD going to your thermostat.
I used to install carriers and never had to install a NIM board. Didn't even know they were a thing. It was always a very easy wiring configuration of connecting all the ABCD wires in their rightful place. Almost bulletproof unless you're severely color blind.
I'm confused about the part of the ABCD wiring where you have one black wire on the D terminal. It should be a very clean connection of ABCD to everything that requires ABCD with all colors matching.  There shouldn't be any splicing or anything else tied in between. C and D are the 24v power wires, and the A and B are the communicating wires. I'd start by correcting that. From the looks of the wires from the outdoor unit, they appear to be correctly placed and likely wouldn't be part of your issue.
What exactly is the fault you're getting? Usually when I come across these ECM modules giving faults, they will never be clear for 8 hours, or a day. They instantly show up.
But again, I can't understand why a NIM module is used when the board on the air handler has the area for connecting non-communicating AC/HP. The manual for the NIM says it would be needed if you had a non-communicating two speed heat pump. (which you don't since the Y2 isn't connected)

This is the requirements when a NIM is suddenly needed:

-A Heat Recovery Ventilator / Energy Recovery Ventilator (HRV/ERV) (when zoning is not applied). If system is zoned (contains an Infinity Damper Control Module), the ventilator may be connected either directly to the Damper Control module or to the NIM. In either case, the Infinity Zone Control will properly discover the ventilator.
-A non-communicating single-speed heat pump with Infinity furnace (dual fuel application only).
-A non-communicating two-speed outdoor unit (R-22 Series-A unit).

[rgs80074]

I can try bypassing the nim board all together.  I just don't understand why they had to install it to begin with.  I mean it was many years ago but I remember them getting everything install and the system did not work and they was told to go get the board and install it just not sure why.


I'm confused about the part of the ABCD wiring where you have one black wire on the D terminal
   That wire is also confusing but it was originally wired that way from the original installation per my pictures.  The wires from the outside unit are all attached to the nim board(green wire not attached but it was not originally and I see no where it could connect too.   That black wire comes from down below in the air handler around the coil area along with the other brown wire.

the black wire then splits off into two parts, one part goes to the nim and the other part to the red wire in the group of wires (in the brown) that also comes from the coil area.  I am not sure what those wires do, I believe the black wire is given power somehow by being spliced into the red one.

I am not good with wiring diagrams but everything I found left me confused on that black wire.  It appears the black wire on the nim should be a red wire but as I said thats not how it originally was wired.


So if I bypass that nim board,  where would that black wire go to?  I don't even know what it is for and it seems like if thats not needing power that other cord coming from the coil area is not needed either cause it was only connected to the black wire on one side with the red power wire (assuming power).

I believe the code right now is 44 i believe,  other times it was a 45, etc

But its not allowing me to enter into the setup/install menu like it should.  Last thing when I put it back together and turned power on it did its communicating and could not communicate with the outside unit.  trying to select heat pump from the menu but nothing was changing it and then it went away.  But up until the tech's messed with it the nim board always light up its two status lights.

I'll try bypassing the nim board see what happens but that will likely be about a week.

Thanks
Ryan