Watlow series F4 controller end-of-life: What it means for your chamber?

Watlow has officially announced the End-of-Life of the SERIES F4 controller product line, including F4S, F4D, and F4P controllers.

• Last Time Buy Date: May 29, 2026
• Last Time Ship Date: May 31, 2027
• Last Date of Service: May 31, 2032

According to Watlow, all SERIES F4 controllers, configurations, and related spare parts will no longer be available for purchase after May 29, 2026.

What Does This Mean if You Have an F4 Controller?

If your environmental test chamber currently uses a Watlow F4 controller, it can continue operating normally. However, as the platform phases out, the availability of replacement parts and long-term support options may become more limited over time.

This is a good time to begin evaluating long-term support and upgrade options for your chamber systems.

How AES Can Help

AES can continue supporting customers with existing F4-controlled chambers, including:

• F4 troubleshooting and service support for AES chambers
• Chamber evaluations and modernization recommendations
• Retrofit solutions for aging controllers
• Long-term upgrade planning

AES can retrofit and modernize environmental test chambers from AES and other chamber manufacturers. Our team works directly with customers to determine the best controller upgrade solution for their application, testing requirements, and long-term support needs.

Upgrade from F4 to the Watlow F4T

AES can retrofit existing F4 controllers to the Watlow F4T controller.

Benefits of upgrading to the F4T include:

• Modern touchscreen interface
• Improved usability and connectivity
• Expanded communications capabilities
• Enhanced long-term supportability
• Simplified setup and troubleshooting

When retrofitting to an F4T controller, chambers can also integrate with AESONE CONNECT®, AES’s remote monitoring platform.

AESONE CONNECT® allows users to:

• Monitor chambers remotely
• Receive alarm notifications
• View chamber status in real time
• Improve lab visibility and connectivity

If your chamber currently uses a Watlow F4 controller, AES can help you evaluate the best path forward for your testing operation.

AES can retrofit and support both AES chambers and chambers from other manufacturers. Whether you are looking to continue maintaining your existing controller or upgrade to a more modern connected solution, our team is here to help you make the right decision for your lab and long-term testing needs.