Hi everyone, I am new to the forum and hope to get helps on a topside panel issue of my Balboa 2000 spa. The spa is a used one with the controller 52761-01. The seller told me the spa runs but the heater does not work. After I made the power connection and turned the spa on, I found the topeside panel showed 8888 and then within a few seconds it turned to blank . But the economic mode seems run at least once a day. I checked the power voltages on PCB. They seem all correct. I wanted to check transormer's condition but don't know where to measure and what are the correct input and output voltages. The seller seems trustable, so I think the topside panel may be ok. Anybody know what might be the problem. Thanks. Victor