Welcome to our forum.
The control box is an IQ2000. I went by the manual and ran #8 wire to the sub box that came with the tub. Main breaker is 50 ground fault and sub box has 20 ground fault and 30 ground fault. I ran the wires from the 20 and 30 amp breakers to my control box just like the manual showed with the white wire hooked to the load side of breaker. After I filled the tub and made sure filters were good and all air bubbles gone, I turned on the power. My heater came on, no reset was tripped, my circulation pump came on and pushed water great. Everything looked fine, then after 5 seconds, shuts off. Wait few minutes then back on, just to shut down again. When tub shuts down, I still have power going to my control board. Never trips my breakers. Hopefully someone has been through this and can help me out. I've looked at the IQ2020 boards and they are expensive. I will hate to spend that on a board and it not be the problem. The guy I bought the heater from only cut breakers off and drained it. Never unhooked the wires from the board so I know all them wires are like they were when it was running. I only traced each wire from the board and hooked it to the breakers like the manual said. I know my 30amp is for the blower motor and the 20amp is for the rest. Everything looks fine.I can't seem to put my finger on what's going on. Only the transformer gets hot on the board before it shuts down is all I can tell. No flashing codes. No tripped breakers. Thanks for any help.
Most circ pumps have their own filter, remove the filter and put your hand on the suction side where the filter was. It should have enough suction to hold your hand down. If so the pump sounds fine. I would check or replace flow switch or pressure switch next. They are relatively in expensive parts. If it doesn't work after that, maybe replace the high limit after that probably the board. Really odd there are no error codes. Tman thoughts?