My old hot tub circuit board was a balboa 51049. The heater would not heat and I determined it to be a relay was not working on the old board. My old board is discontinued and the new upgraded model is a balboa M2/M3 52518. The heater now works but pump 2 will not work. The wiring schematics are here. http://www.spacare.c...a/M3_Wiring.pdf
The hot tub is a Coleman Horizon 400 and the schematic is on the 2nd to last page/pg 25. I got a new topside panel as well so that shouldn't be the problem. Pump 1 works fine and is a 240v 2 speed however pump 2 has only 3 wires (White, Black, Green) so I assume its 120. I hooked the new board up the same way as the old board. The only thing that I can see is that the old circuit board schematic has the pumps white wire goes to the relay bar and the new one has it on a tab by the heater, so essentially it looks like the wires are switched. The white wire is also hot with 120v going through it unattached to the relay bars which I find that strange from what I know about electricity. I do not have a neutral on the hot tub as the old circuit board did not need one. I know the pump works because if I attach it to the white wire of the 240v pump, it will turn on. Anyone have suggestions? Should I add a neutral as the new schematics calls for, switch wires or any other suggestions?