Swimables | SW-41-063 | MasterTemp / Max‑E‑Therm Style High Limit Switch – Essential Heater Safety Component

Swimables SW‑41‑063 high limit switch for Pentair MasterTemp and Sta‑Rite Max‑E‑Therm heaters. Detects high water temperature (>135 °F), shuts off gas for safety, compatible OEM replacement (42001‑0063S).

Key Features:

• OEM‑equivalent replacement: Replaces Pentair/Sta‑Rite part #42001‑0063S (also known as STA‑151‑6255), compatible with MasterTemp and Max‑E‑Therm models SR200, SR333, SR400 

• High‑temperature cutoff: Designed to trip at approximately 135 °F to immediately shut off gas flow when water temperature exceeds safe limits 

• Safety‑critical function: Prevents heat exchanger damage and system faults by responding to “HLS” error code on the heater control board 

• Durable construction: Brass housing and dual spade terminals ensure rugged use and secure electrical connection 

• Easy installation: Compact inline switch with two spade connectors fits directly on manifold—no wiring harness required 

Product Overview:
The Swimables SW‑41‑063 High Limit Switch is a direct-fit, high-quality replacement for the Pentair/Sta‑Rite OEM part #42001‑0063S. Installed in the outlet of MasterTemp and Max‑E‑Therm heaters (models SR200, SR333, SR400), this switch serves as a crucial safety device. It continually monitors water temperature, and if the system exceeds approximately 135 °F, the switch immediately opens the gas circuit—triggering an “HLS” fault and shutting down the heater to prevent overheating and protect the heat exchanger.

Housed in durable brass with dual spade terminals, the SW‑41‑063 is built for long-term reliability. It’s a one-time-use safety device—once tripped it must be replaced to restore protection. This compact unit mounts easily onto the manifold, and its simplicity ensures faster service calls and reduced downtime.

Ideal for pool technicians and knowledgeable homeowners, installing the SW‑41‑063 reinstates critical safety functions and allows the heater to resume normal operation. It’s recommended to replace this switch upon HLS fault indication or during preventive maintenance to ensure continued safe and efficient heating performance.