Sorry this is no longer made. You can replace with the new VS501 board, that has an option to work with a 1-pump topside.

Balboa VS-500 Printed Circuit Board.

Cross Reference Numbers: 33-0032A, 33-0032A-K, 33-54369-K, 3-60-0069, 3-70-0823, 3-70-0927HQ, 53434, 53551 or 53552  (this board will not support Silent Sentury Lights), 53728, 53749, 53794-03, 53795, 54200-01, 54201, 54216-Z, 54219-Z, 54291-02, 54292 (verify topside button layout), 54335, 54336, 54350-01, 54351, 54358, 54359, 54364, 54365, 54368, 54368-01, 54368HC1, 54368HC2, 54368HC3, 54369, 54369-01, 54369-02, 54369-03, 54370-02, 55031 (this board will not support Silent Sentury Lights), 55032, 55032-01, 55032-02, 55056, 55139, 55140, 55230, 55263, 55264, 55506, 55507, 56694, 56695, 56767, 56768, 59005, 59005-01, 59-138-1680, 58-138-2056, CS6100B-U-WP, MX-1000 and others.

Common chip numbers that can be replaced with this board (chip numbers are usually found on a large chip near the centre of the board):

100CR1A, 100CR1B, 100CR1C, 100D, 100DR1A, 100DR1B, 100DR1C, 165R1A (verify topside button layout), COB500, 54201R, COB500R2A, FREE300R1A, GV5500R2B or GVS500R1A or GVS500R1B or GVS500R2A or GVS500R2B (this board will not support Silent Sentury Lights), KEYS1000R1A, KEYS100CR1B, KEYS100DR1A, KEYS100DR1B, LPI300AVR1A, MS360R1A, MS360R1B, MS360R1C, MVS500ZR2D, VKV500R1A, VS120RR2A, VS120RR2B, VS120RR2C, VS300AV, VS300AVR1A, VS300FH4, VS300FL4, VS500R1A, VS500R1B, VS500TM1R1A, VS500TM1R1B, VS500TM1R1C, VS500TM2R2A, VS500TM2R2B, VS500TM2R2C, VS500ZR2A, VS500ZR2B, VS500ZR2C, VS500ZR2D, VS612R1, VS612TR1A and others.

Will Operate:

Pump 1 (2 Speed or 1 Speed)
Circulation Pump
Ozonator
Audio/Video (AC Hot Output)
Light
No Secondary high speed pump or blower

Make sure pump 1 is rated a maximum of 12 Amps.