Product Overview

The Pentair 42001-0060S Water Pressure Switch is a genuine OEM replacement safety component designed for compatible Pentair MasterTemp® and Sta-Rite Max-E-Therm® pool and spa heaters. This switch monitors water pressure and flow through the heater and signals the control board that adequate water circulation is present before allowing the heater to ignite.

If water flow falls below the required level due to a dirty filter, closed valve, pump problem, or plumbing restriction, the pressure switch prevents the heater from firing. This important safety feature helps protect the heat exchanger from overheating and potential damage caused by operating without sufficient water flow.

A failed or malfunctioning pressure switch may cause the heater to display a no-heat condition, fail to ignite, cycle improperly, or generate water flow-related service errors. Replacing a defective switch with the genuine Pentair 42001-0060S restores proper heater safety operation when the pressure switch has been confirmed as the source of the problem.

Key Features

Genuine Pentair OEM replacement part

Monitors water pressure before ignition

Prevents heater operation without adequate water flow

Direct replacement for compatible MasterTemp and Max-E-Therm heaters

Helps protect the heat exchanger from dry-fire damage

Factory-calibrated for reliable operation

Durable weather-resistant construction

Simple electrical connection

Designed for long service life

Professional installation recommended

Benefits

Restores proper heater safety operation

Helps eliminate false water-pressure shutdowns

Protects expensive heater components

Ensures proper ignition sequencing

Maintains reliable pool and spa heating

Genuine OEM fit and performance

Cost-effective repair compared to replacing larger heater assemblies

Specifications

Warranty & Compatibility

Compatible Models

Compatible with many Pentair and Sta-Rite heaters, including:

• MasterTemp 175
• MasterTemp 200
• MasterTemp 250
• MasterTemp 300
• MasterTemp 333
• MasterTemp 400
• Sta-Rite Max-E-Therm 175
• Sta-Rite Max-E-Therm 200
• Sta-Rite Max-E-Therm 250
• Sta-Rite Max-E-Therm 300
• Sta-Rite Max-E-Therm 333
• Sta-Rite Max-E-Therm 400

Not compatible with 125,000 BTU MasterTemp or Max-E-Therm heaters.

Common Symptoms of a Failed Pressure Switch

Replacement may be required if your heater experiences:

• Heater will not ignite despite proper water flow
• Intermittent heating
• Water pressure or flow safety faults
• Heater cycles on and off unexpectedly
• Corroded or leaking pressure switch
• Failed continuity during diagnostic testing

Always verify proper pump operation, clean filters, and unrestricted plumbing before replacing the pressure switch, as insufficient water flow can produce similar symptoms.

Installation Information

Disconnect electrical power and shut off the gas supply before servicing the heater. Allow the heater to cool completely and relieve all system pressure.

Remove the existing pressure switch, install the new OEM switch, reconnect the wiring, and verify that all threaded connections are properly sealed. After restoring power and water flow, test heater operation to confirm normal ignition and safe shutdown functions.

Installation should be performed by a qualified pool professional or licensed service technician.

Confirm Before Ordering

Please verify:

• Your required part number is 42001-0060S
• Your heater is a compatible MasterTemp or Max-E-Therm model
• Your heater is 175K–400K BTU
• You have confirmed the pressure switch is the failed component
• Proper water flow and filtration have been verified
• You are replacing the pressure switch only

Warranty Information

This genuine Pentair replacement part is covered by Pentair's applicable limited manufacturer warranty against defects in materials and workmanship. Damage caused by improper installation, freezing, excessive pressure, electrical issues, water intrusion, or misuse is not covered.

Customer-Facing Q&A

Q: What does this pressure switch do?
A: It verifies adequate water pressure before allowing the heater to ignite, protecting the heat exchanger from damage.

Q: Will this fit a MasterTemp 400?
A: Yes. It fits compatible MasterTemp 175, 200, 250, 300, 333, and 400 BTU models.

Q: Will it fit the 125K MasterTemp heater?
A: No. This part is not compatible with the 125,000 BTU heater.

Q: Can a bad pressure switch prevent the heater from firing?
A: Yes. A faulty pressure switch can prevent ignition because the control board cannot verify proper water flow.

Q: Is this a genuine Pentair part?
A: Yes. Part number 42001-0060S is a genuine Pentair OEM replacement pressure switch.