I recently bought used Coleman Spas Brand Maax 750 manufactured on 3-14-02.c the control panel came right on, but all it says is Lo, the light on the main board also comes on but I could not get any of the lights in the tub or any of the pumps to come on, non of the buttons on the control panel seemed to do anything. I don't know what the problem is, if the control pad went bad, or if it needs a new fuse or what. Is anyone out there that can suggest what might be wrong ?

not sure of equipment used but if its gecko it could be low level programming with Lo on display as a lighting parameter due to a stuck touchpad button, but will likely be something else with a different controller