I was investigating why my solar heat wasn't turning on. Going through the diagnostic menu on my Aqua Logic controller, the water temp was reading 113F. Safe to assume the temp sensor is bad? Looks like the correct part may be GLX-PC-12-KIT; can anyone confirm? The listing on Amazon says it's compatible with the PS-8, but my controller is the P-4 (4 relays vs 8 relays). Thanks for the help.