Fixing a Pentair MasterTemp 400 Temperature Sensor
If you've walked out to your pool only to find the water is freezing, the pentair mastertemp 400 temperature sensor might be the reason your heater is giving you the cold shoulder. It's one of those small parts that you don't really think about until it stops working, and suddenly, your weekend plans for a warm swim are out the window. This little sensor is the "brain" that tells the heater how hot the water is, so when it starts sending bad data, the whole system just shuts down as a safety precaution. ...