Hayward AquaLogic "Communication Err 2"

[Henryrose88]

Hey Everyone, i need some assitance on troublshooting the"Communication Err 2" Error on my Aqualogic.
Here is what I know:
The pool right now will not run. The pool pumps will not come on at their correct times at all. I noticed the issue yesterday morning when I looked outside at the scheduled filter time and the filter was off.
I go out to the Local Control panel and the display says "Communication Err 2" call 1800 number.. I did this, they forward me the troubleshooting guide.
The troubleshooting guide from Hayward mentions to check the cable continuity between the Local Display GLX-LOCAL and the PCB-Main. That checked out fine. If the cable is good, replace the Local Display (GLX-LOCAL-PS-8. $550) and if that doesn't fix it replace the Main Board (GLX-PCB-MAIN, $800). I could be looking at 1400 after all said and done..
I took out and inspected the Local Display board, I noticed some corrosion on the the leads for the LCD display (which displayed fined). Wiped off with a paper towel and corrosion is gone. No other sign of issue. Solder joins where the corrosion was are not shorted.
I took out the main board and everything looked find. No capacitors seemed blown. Resistors were good. Fuses good.
With everything plugged in and powered off, I pulled remote connects (remote, valves, external relays, temperature senor, etc..) one by one to see if the comm err 2 cleared and it didnt.
Is there any way to tell if my Local Display is bad or the Main PCB?
Any other tests?

 

[ajw22]

We have various threads about the problem and all the threads taper off without hearing a resolution.

If you figure it out please let us know.

Maybe @1poolman1 has seen this.

 

[Henryrose88]

i purchased a new GLX-LOCAL-PS-8. I've got a good 10V coming from the main pcb. The corrosion on the local display board as well as not getting any volts with a dvm on some of the test points. fingers crossed this works, i'll update.

 

[Henryrose88]

For documentation purposes for the next unfortunate aqualogic owner the problem has been resolved.
I first purchased a GLX-LOCAL-PS-8. I got it in plugged in the ribbon cable and right away "communication err 2"... Great now i need to buy the GLX-PCB-MAIN. Thankfully the store gave me a return for the GLX-LOCAL - the restocking fee. The PCB Main fixed my issue. All Good now.

I'm saving my bad PCB-Main - Anybody know of a good refurb company?