Pentair
Pentair High Limit Switch 42001-0063S - for Max-E-Therm & MasterTemp
Pentair High Limit Switch
Genuine Pentair 135°F high-limit safety switch for compatible MasterTemp, MasterTemp 125 A/G, Sta-Rite Max-E-Therm and Pentair ETi pool heaters. Designed to interrupt heater operation when excessive water temperatures are detected.
Warranty Information
1-Year Manufacturer Warranty
Ultimate Pools is your first point of contact for compatibility verification, installation guidance, and warranty support.
The Pentair High Limit Switch (42001-0063S) is a genuine Pentair replacement safety component designed for compatible Pentair MasterTemp, MasterTemp 125 A/G, Sta-Rite Max-E-Therm and Pentair ETi pool and spa heaters. This 135°F high-limit switch monitors heater water temperature and opens the safety circuit when its temperature threshold is reached.
As part of the heater's safety-control system, the high-limit switch helps protect the heat exchanger and internal components from excessive temperatures. A high-limit condition or malfunction may be associated with an HLS error code on compatible heater controls. The 42001-0063S features spade terminal connections and a 1/4" NPT threaded connection. Replacement should follow professional diagnosis to determine whether the switch has failed or another heater condition is causing the safety circuit to open.
Key Features
Original Pentair high-limit safety switch designed for specified Pentair and Sta-Rite pool heater models.
High-limit switch with a specified 135°F temperature threshold for compatible heater safety-control applications.
Opens the heater safety circuit when the specified temperature threshold is reached, interrupting heater operation.
Listed for compatible Pentair MasterTemp, MasterTemp 125 A/G, Sta-Rite Max-E-Therm and Pentair ETi heaters.
Features spade terminal connections for the applicable heater safety circuit.
Replacement part used during professional troubleshooting of high-limit safety faults and HLS error conditions.
Compatibility & Fitment
The Pentair 42001-0063S High Limit Switch is listed for the following Pentair and Sta-Rite pool heater models:
- Pentair MasterTemp Heaters: 460792, 460793, 460730, 460731, 460732, 460733, 460734, 460735, 460736, 460737, 460805, 460806.
- Pentair MasterTemp 125 A/G Heaters: 461058, 461059, 461060, 461061.
- Sta-Rite Max-E-Therm Heaters: SR200NA, SR200HD, SR200LP, SR333NA, SR333HD, SR333LP, SR400NA, SR400HD, SR400LP.
- Pentair ETi Heaters: 461112, 461113.
Temperature Rating: 135°F.
Connection Configuration: Spade terminals with a 1/4" NPT threaded connection.
Replacement Guidance: Confirm that your heater requires Pentair high-limit switch 42001-0063S. Verify the original switch part number, temperature rating, connection configuration and heater model before ordering. High-limit switches with different temperature ratings or connection specifications should not be assumed interchangeable.
Compatibility may vary by production year, configuration and installation. Verify your exact model and part number before ordering.
Applications
- Replacement of a confirmed faulty high-limit safety switch in compatible Pentair and Sta-Rite pool heaters
- Heater overtemperature safety monitoring and circuit protection
- Professional diagnosis and repair of HLS error conditions
- Servicing compatible Pentair MasterTemp and MasterTemp 125 A/G heaters
- High-limit safety switch replacement in specified Sta-Rite Max-E-Therm and Pentair ETi heaters
- Maintenance and repair of pool and spa heater safety-control systems
An HLS error or high-limit shutdown does not necessarily indicate a defective switch. Water circulation problems, overheating conditions or other heater faults may cause the safety circuit to open. The underlying cause must be diagnosed before replacement.
Professional Installation Recommended
All service on gas appliances shall be performed by a licensed contractor. High-limit switch replacement must follow Pentair manufacturer instructions and all applicable electrical, plumbing, gas, bonding and building codes.
Before servicing, the heater must be safely shut down, allowed to cool and isolated from electrical power, gas and water circulation as required by the manufacturer. The technician must confirm the correct replacement switch, inspect the existing wiring and investigate the cause of any high-limit shutdown.
Installation must follow the manufacturer's procedures for the threaded connection, electrical terminals and any required sealing components. After replacement, the contractor should verify proper heater operation and confirm that the safety circuit functions as intended.
Important: Never bypass, jumper or disable a high-limit safety switch to operate the heater. Repeated HLS faults or high-limit shutdowns require professional diagnosis of the underlying condition. Do not install a switch with an unapproved temperature rating.
Specifications
| SKU | 42001-0063S |
| Alternate Part Number | STA-151-6255 |
| Brand | Pentair |
| Product Type | Pool Heater High-Limit Safety Switch |
| Temperature Rating | 135°F (approximately 57°C) |
| Function | Overtemperature Detection and Heater Safety Circuit Interruption |
| Connection Type | Spade Terminal Connections |
| Thread Size | 1/4" NPT |
| Compatibility | Specified Pentair MasterTemp, MasterTemp 125 A/G, Sta-Rite Max-E-Therm SR200/SR333/SR400 and Pentair ETi heater models. See Compatibility & Fitment for exact model numbers. |
| Application | Pool & Spa Heater High-Limit Safety Control |
| Installation | Licensed Contractor Required |
| Warranty | 1-Year |
| Final Sale | Yes |
Frequently Asked Questions
The 42001-0063S is a 135°F high-limit safety switch that monitors heater water temperature and opens the safety circuit when its specified temperature threshold is reached. This interrupts heater operation to help protect against overheating.
This switch is listed for specified Pentair MasterTemp, MasterTemp 125 A/G, Sta-Rite Max-E-Therm SR200, SR333 and SR400, and Pentair ETi heater models. Refer to the Compatibility & Fitment section for the complete list of model numbers.
An HLS error indicates a condition involving the heater's high-limit safety circuit. It may be caused by an overheating condition, inadequate water circulation, a faulty switch or another related issue. A licensed contractor should diagnose the cause before replacing components.
Never bypass or disable a high-limit safety switch. If the heater reports a high-limit fault, the underlying cause must be identified and corrected. If the switch is confirmed defective, replace it with the manufacturer-specified component and follow the applicable service procedure.
The Pentair 42001-0063S high-limit switch is covered by a manufacturer warranty against defects only and is designated final sale. Verify the required part number, 135°F temperature rating and heater compatibility before ordering.
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