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Balboa Expander Board 55138
Balboa Expander Board 55138
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The Balboa Expander Board 55138 is a 2-speed pump relay expander PCB designed for older GS and BP boards with black transformer. It's a direct fix for a failing pump relay, restoring full pump control without replacing the entire control system.
- Genuine Balboa expander PCB — part number 55138
- Supports one 2-speed pump
- Protected by a 30 AMP fuse
- Compatible with older GS and BP boards (black transformer)
- Balboa part number: 55138
- Dimensions: 115mm (L) x 47mm (H)
- Power: 230V, 50Hz
- Fuse protection: 30 AMP
Balboa is the industry-standard brand for spa control electronics, trusted for reliable, precise performance. This genuine expander board restores full 2-speed pump function without the cost of a complete control system replacement.
This replacement PCB must only be used for its intended system. Installation should be carried out by a qualified professional to avoid damage or warranty invalidation.
Not sure which replacement part your spa needs? Our Aftersales team is on hand for expert guidance, backed by our satisfaction guarantee.