My Mastertemp 400 fires and starts to heat up but when it reaches about 83-85 degrees the service heater comes on and not more heat and the HLS indicator light on the circuit board lights up. I have a salt water pool and had the whole manifold replaced about two years ago. I just replaced the thermal regulator, thermistor and the high limit switch but the problem still persists. It heats up to about 83-85 degrees and then the service heater light comes on. My next thought is to take the manifold off and replace the manifold bypass valve. Is there a way to test the manifold bypass valve without taking off the entire manifold? Any help would be greatly appreciated.
Thanks,
Thanks,