Pool and Spa
Questions about Pool Repair? Ask an Expert Online.
OK well the transformer controls the power to topside. Open the control box and look for the transformer white square plug in the center of board, unplug it check for damaged wires, re-install plug and power up spa again and see if it works. From there you need to test voltage going into the transformer it should be 220 and then test voltage out and it should be 12-24 volts. You could also have a bad topside but lets take it one step at a time.
Well it sounds like you have proper voltage from transformer, so at this point I would have to say you have a bad topside. Every topside has it's own small circuit board in it but that is encased in electrical goo so there is no access if voltage is good then it must be a bad topside. It is possible that it is a bad board but I dont think that is the case.