Product Overview

Replace a damaged or failed heater terminal board with the Pentair 42001-0056S. This genuine Pentair electrical replacement part is listed for compatible MasterTemp, MasterTemp 125, and Sta-Rite Max-E-Therm pool and spa heaters.

The terminal board provides a connection point for wiring within the heater’s electrical system. If its terminals are corroded, damaged, or overheated, a qualified technician can replace the board as an individual component. Because a wiring fault or loose connection can damage a new board, the cause of the failure should be identified before the heater is returned to service.

Key Features

• Genuine Pentair replacement terminal board
• Manufacturer part number 42001-0056S
• Listed for MasterTemp, MasterTemp 125, and Sta-Rite Max-E-Therm heater electrical systems
• Replaces the terminal board without requiring a complete control assembly
• Suitable for heater repair after the board has been confirmed as the faulty component

Compatibility & Specifications

Verify your heater’s full model number and the part number on the existing board before ordering. Electrical components can vary by heater configuration and production date.

Important Part Distinction

The 42001-0056S is a terminal board. It is not the heater’s main control board, ignition control module, transformer, or fireman’s switch fuse. Those components are listed separately and should be selected only after the heater has been properly diagnosed.

Installation & Service

Turn off and disconnect electrical power before servicing the heater. A qualified pool heater technician should document the existing wire connections, inspect the terminals and wiring for heat damage or corrosion, and install the replacement according to the instructions for the specific heater model.

After installation, the technician should confirm that all connections are secure and that the underlying electrical issue has been corrected. Replacing the terminal board alone may not resolve an ignition or control problem caused by another component.

Frequently Asked Questions

Does this fit a Pentair MasterTemp 125?
Yes. Part 42001-0056S is listed as the terminal board for the MasterTemp 125 electrical system.

Does it fit Sta-Rite Max-E-Therm heaters?
It is listed in the Max-E-Therm electrical system parts diagram. Confirm your heater model and existing part number before purchase.

Is this the main heater control board?
No. The terminal board and main control board are separate components.

Will this fix a heater that will not start?
It will address a faulty terminal board. A no-start condition can also involve wiring, sensors, switches, the ignition system, or the control board, so diagnosis is necessary.

Is the fireman’s switch fuse included?
Do not assume the fuse is included. It is listed as a separate replacement part.