The Balboa Expander Circuit Board, VS520SZ (55137) enhances spa system control, providing reliable performance, easy integration, and expanded functionality for optimal operation.

Specifications:

• OEM part number: 55137
• Manufacturer: Balboa Water Group
• Series: VS520SZ
• Type: Expander circuit board

Fits/replaces:

• Balboa VS520SZ spa control systems
• Direct OEM replacement for part 55137

Common signs you need this part:

• Spa is completely non-responsive
• Expanded functions or accessories fail to operate
• Intermittent operation or unexpected shutdowns

Returns & installation: Please confirm this board is compatible with your specific Balboa VS520SZ system before ordering. Installation should be performed by a qualified spa technician with power disconnected.

FAQ

Q: What system is this expander board designed for?
A: It's designed for Balboa VS520SZ spa control systems.

Q: What does an expander board do?
A: It expands the functionality of the main circuit board for additional spa control features.