This PCB is fitted to the GS510SZ spa pack and is used as a replacement for an existing GS510SZ control box with a PCB failure. No other replacement will work correctly without modification - the board will have a sticker on it designating s/n 54518. Typically the code is on a sticker on the side of the transformer and will clearly state 54518. If not, to see how to identify please click here .

This should be fitted by a competent individual as a faulty install will result in board damage. We can easily explain the process of installation over the phone - call us on 01746 710475.