This is the main circuit board for a Balboa BP 501 / 601 (X) spa controller system. Also comes with sub-relay circuit board. Note these two boards are not sold separately. This only fits the taller boxes of approx 300mm. It does not fit the 270mm box. If you have the shorter box, you will need to purchase the replacement controller.
This controller is also known as:
BP601 / BP / BO601X / SIBP601X / Dominator Spa Control
BALBOA DOMINATOR BP (SIBP601X) SPARE PARTS: