Mastertemp 400 Control Board Buying Guide with Review

Product Highlights

• Replacement High Limit Switch (135 °F) for Pentair Sta-Rite MasterTemp & Max E Therm Pool Heaters
• Replaces part no. 42001-0063S & STA-151-6255
• Compatibility: Pentair MasterTemp (all models) & Max-E-Therm (models SR200, SR333, SR400) heaters
• Manufactured by Optimum Pool Technologies

Features

• Flue gas exhaust sensor: part no. OPT-42002-0024S: A flue sensor, which is located on the exhaust elbow of a pool heater, prevents the flue from going above 500°F. If this fails, your system will display error codes E05 or E06 to indicate that the flue sensor needs to be replaced.
• Heating Pressure Switch: Part No. 42001-0060S: The water pressure switch works by turning off the burner if the water flow is interrupted. If water flow is restricted, the water pressure switch can prevent the burner from igniting and cause the “Service System” light to illuminate.
• Gas Shutoff Switch: Part No. OPT-0025S: The gas shut-off switch is an important switch in your Max-E-Therm or MasterTemp pool heater and is used to detect when the outlet temperature of your heat exchanger has exceeded a safe level (140°F) and the switch will open immediately when that happens.
• Heating thermistor: part no. OPT-42001-0053S: If the temperature on your control panel display shows an incorrect temperature, your thermistor may need to be replaced. Thermistors often show a much too high temperature at the end of their life.