Pentair Heater Pressure Switch 42001-0051S

Pentair Heater Pressure Switch – 42001-0051S

Genuine Pentair water pressure switch for MasterTemp and Max-E-Therm heaters. Ensures adequate water flow before allowing ignition.

Specifications

• OEM Part Number: 42001-0051S
• Type: Normally open water pressure switch
• Function: Closes at minimum required water pressure

Compatibility

Direct replacement for Pentair MasterTemp 200-400 and Sta-Rite Max-E-Therm 200-400 pool heaters.

Installation Tip

Before replacing, check for clogged passages, dirty filter, or low pump flow — common causes of pressure switch errors.