The OEM Pentair Hi Limit Switch 42001-0063S is a safety switch used to detect when water temperature has exceeded a safe level (135¡F) and immediately opens the heat exchanger out. When this fails, your system will typically show error code HLS.ÊThe Hi Limit Switch cannot be reset, it must be replaced. This OEM Pentair Hi Limit Switch 42001-0063SS is compatible with most Pentair MasterTemp and Sta-Rite Max-E-Therm Natural Gas Swimming Pool Heaters.Ê

• Critical Safety Feature:ÊActivates by detecting unsafe water temperatures above 135¡F, instantly preventing heat exchanger overload.
• Error Code Indicator:ÊDesigned to display an HLS error code as a clear indicator of failure, necessitating a timely replacement.
• Mandatory Replacement:ÊAs a non-resettable component, this OEM Hi Limit Switch is built to be replaced, not repaired, ensuring ongoing safety.
• Broad Compatibility: Compatible with a wide range of Pentair heaters, including MasterTemp and Sta-Rite Max-E-Therm Natural Gas models.

• Pentair Sta-Rite Max-E-Therm Heaters
• Pentair MasterTemp Heaters
• Pentair ETI 400 Heaters