I can't imagine J&L would have sold me a brand new malfunctioning unit

I'm going bloody insane. This should not be that difficult. I'm up at 4 am so gotta crash. When I get home, just for the sh#ts and giggles of it I'm going to take the old, functioning dry side on the right, and swap it with the new, malfunctioning side on the left. That is the ONLY thing I haven't tried.

When you're doing the reset are you doing it on the tank coupled with wet & dry sides together ?

Both ways. Coupled together dry, aligned and in functioning position on tank......

Try taking the unit off the tank , with the wet side off & far away

Plug it in then hold down mode button , it should start flashing white on the dial

If it does hold down mode & set at the same time

If it starts flashing white & yellow unplug the power cord from the drive box wait like 2 seconds and plug it back in

Good luck

I had same error red/green arrive on the mp10 for my salt mixing station last night.
Found some corrosion on the power conecition pin driver side.

Cleaned it up and good to go.
HTH

Have you tried swapping the driver https://www.liverocknreef.com/includ...alone.jpg&w=30 to see if its the driver that is the issue?
If that is your problem PM me I have a spare.

Yup.....Swapped drivers. Faulted driver worked perfect on other pump.