The Balboa VS504SZ Circuit Board (54638-01) is a serial standard replacement control board from Balboa Water Group, built to manage pump, lighting, and auxiliary functions for compatible spa systems.

Specifications:

• Part number: 54638-01 (alternate part number G1153)
• Model: VS504SZ (chip VS504SZR1B)
• Supports Pump 1 (2-speed) and Pump 2 (1-speed)
• 12V light output
• Ozone and A/V circuit support
• Uses an 8-pin topside control connector

Fits/replaces:

• Coast, Artesian, and Coleman by MAAX spa systems originally equipped with the Balboa VS504SZ circuit board, part 54638-01 or G1153

Common signs you need this part:

• Spa won't heat or maintain set temperature
• Error codes displayed on the topside panel
• Pumps or other components fail to respond to commands

Returns & installation: This is an electrical component. Per our terms and conditions, electrical parts are non-returnable once installed. Please confirm your existing part number matches before ordering, and have a qualified technician perform installation.

FAQ

Which spa brands use this board? It's commonly used in Coast, Artesian, and Coleman by MAAX spa systems that use the 8-pin VS504SZ control setup.

What functions does this board support? Pump 1 (2-speed), Pump 2 (1-speed), 12V light, ozone, and A/V circuits.