Balboa GS501z PCB

Balboa GS 501Z replacement printed circuit board (also VS) - used on many spas 

eprom marked - GS501ZR2B

Original PCB's looked different to this one with eprom marked SCS501R1A, GS501ZR1B and other designations. Therre may have been different socket positions and designations.
The attached pdf has the correct settings and socket designations for this replacement pcb. It may differ from original dip switch settings also.

Programming must be set PRIOR to connection any 2 speed pump.