I actually disconnected my aux pump weeks ago because I suspected disconnecting it might reduce the amount of heat that gets pumped into my cabin when I run the AC.. it didn't work, but I saw no reason to hook it back up. My CCU has already has some resoldering done to it.. Someone replace a whole trace with solder, that's probably the one that the aux pump already burned up once
There are signs of A LOT of heat on the board, but all the solders look to be in good condition. I already bought and replaced a monovalve, because the gasket on my old one was pretty much ripped off. Does a rebuild kit include the magnet coil? That's what I suspect to be the problem.
This would be a last resort, but does anyone see any problems with just installing a twist valve and shutting down the heater loop during the summer?