Hi, my first post here.
i just picked up a marquis signature reward hot tub, have filled and it switched it on, all seems good so far.
I looked in the locker where the control box is and noticed a box that is unplugged, it almost looks like a mini amplifier/heat sink.
I searched online and found the manual but it doesn't really identify the item as far as i can see, please see attached images I have included. Can anybody advise what this box does as it is unplugged currently.
Many thanks