First time here. Hoping you all can help me. I got a used 1992 Caldera Spa model 9100. I keep getting FLO error at random times, could be within 5 minutes of resetting the breaker or a couple hours. I have removed both pumps and clean them out and have bypassed the pressure switch and made sure the shut offs on the pipes are indeed open and not blocking the flow of water and removed the filter, left the power off for a day, unplugged the battery to try and get rid of the error and turned it on at the breaker, I still get the FLO error. I cannot find a manual for this to even program it probably due to age. What could be causing the FLO error if I have bypassed the pressure switch? Any help is greatly appreciated!