subzero fridge stuck on 55
I bought a used 700TR fridge & it's been in storage about a month & I just installed it & it's stuck on 55. I can scroll thru the zones, but the colder/warmer buttons won't work. The freezer & wine cooler work fine, but not the fridge. If I double tap zone button, it will show 34 & flash the zone, but after a few seconds, it reverts back to 55 or sometimes if I hit colder/warmer button, it will adjust, but after a few degrees, it just shows 2 dashes. No temp. Then double tap again & the light flickers & it shows 55 again. It's cooling @ 55 & I tried the breaker. No luck. Anyone have this issue? Thanks.