When you say display board, do you mean just the LCD screen or whole main board?
If you are getting no red/green lights then most likely same issue I had, need a new thermistor.
I have pretty much the same unit with version R1.45.
What do your lights on the panel show when you power it up? Mine would flash the no flow red light and then no lights on the panel.
Look up my posts, $8 part from DigiKey and find someone to replace it on or do it yourself.
My pool is 12x24 but the side walls are not 100% straight so my width is almost twelve and a half feet. Still not issue with a 12x24 liner but the key to mine is the depth, I needed a 52" liner.
Such a great site this is!!
Using this old thread I made my own DIY saddles and they came out great!
https://www.troublefreepool.com/threads/making-solar-cover-saddles-holders-for-intex-pool-today.123214/
With inflation since 2016 everything cost me approximately $50
Oh and.....pool was...
Correct, my AQT T-5 Cell with version r1.45 does not have the ability to change the cell type at the LCD screen.
i have a T-15 to use as a backup if needed, then I would need to jump the J4 if I want to use it.
So...12x24 fully above ground was 68 degrees at the beginning of June when I opened.
One month with a solar cover on 24x7, running pump 12 hours from 5pm to 5am, I'm pleased to say we enjoyed our 84-85 degree water all holiday weekend.
Had the same as you a few years ago. Once it breaks through the liner it will most likely eat away at the sand/dirt underneath and start building a divot in the bottom.
I drained the pool dry, used some flex seal to fill the divot and seal the leak, cut a piece of foam in a nice circle to fill...