Product Overview

The Pentair 42001-0063S is a genuine OEM replacement high limit switch for Pentair MasterTemp and Sta-Rite Max-E-Therm pool and spa heaters. It is a safety device in the heater's electrical system that shuts the heater down if water temperature inside the heater rises past a safe limit, protecting the heat exchanger and surrounding components from overheating.

⚠️ Important Purchase Notice

This is a heater safety component. Installation should be done by a qualified pool technician following Pentair's heater service instructions and local codes. Never bypass a high limit switch. Inspect the shipment upon arrival and report damage promptly.

Ideal For

• Replacing a failed or faulty high limit switch on a MasterTemp or Max-E-Therm heater.
• Heaters that shut down or show a high limit fault code.
• Pool service technicians repairing Pentair and Sta-Rite gas heaters.

Key Features

• Genuine Pentair OEM part, number 42001-0063S.
• Direct replacement for MasterTemp and Max-E-Therm heaters.
• Part of the heater's electrical safety circuit.
• Compact switch that installs in the original location.

Benefits

• Restores the heater's overheat protection.
• Helps protect the heat exchanger and heater components from heat damage.
• OEM fit means no modifications or adapters.

Compatibility

Fits Pentair MasterTemp and Sta-Rite Max-E-Therm pool and spa heaters. Confirm the part number against your heater's parts list or the existing switch before ordering.

Installation or Upgrade Context

Turn off all electrical power and the gas supply to the heater before servicing. Remove the old switch, install the new 42001-0063S in the same location, and reconnect the wiring as originally routed. Restore power and gas, then test the heater for proper operation.

What’s Included

• One Pentair 42001-0063S high limit switch

Specifications

Warranty

Covered by Pentair’s manufacturer warranty, subject to Pentair’s applicable terms. Contact Pentair for warranty claim instructions; Pool Supply Depot can provide proof of purchase.

Customer Q&A

Which heaters does this fit?

Pentair MasterTemp and Sta-Rite Max-E-Therm pool and spa heaters.

Can I run my heater without the high limit switch?

No. It is a safety device and should never be bypassed. Replace a failed switch with the correct part.

How do I know my high limit switch has failed?

A heater that won't fire or shows a high limit fault even when the water isn't overheating may have a failed switch. Have a technician confirm before replacing.