Pentair 42001 0063S Electrical System High Limit Switch Replacement Pool and Spa Heater

High limit switch

This listing identifies Pentair high limit switch 42001-0063S, described as fitting Sta-Rite Max-E-Therm and MasterTemp pool/spa heater electrical systems. It is a separate safety component from the electronic thermostat circuit board or thermistor probe. Because high-limit switches are safety controls, match the printed part number and service documentation rather than relying on appearance alone.

• Check your old part for 42001-0063S; similar high-limit switches are used across Pentair heater families but are not interchangeable by name alone.
• Match the full switch number and heater family before ordering.

Source: Pentair product listing.