Jacuzzi Z Builder Series Mechanics And Repair page 23

they used the F108/9 control system on their entry level spas. Then they went to a
simpler system, the H136 or H276. These topsides used a dial temperature
control and only one button to change the modes of the spa.
During this time, on their dealer line of spas, they added the "Select" series. It
included a digital topside but was simpler then the Platinum.
Finally Jacuzzi offered the R576 series which give the unit a small digital topside
control with 2 buttons; one for the temperature setting and the other for the jets
and mood light.
REPLACEMENT:
WARNING: As a routine, always touch a metal surface before touching a board.
A static charge from your hand can damage the board.
All of the control boxes have a diagram of the wiring of the board on the cover of
the control box. They are helpful but it's better to replace the board systematically.
F106/7 and F108/9.
These boards are fairly easy to replace if you are careful. First turn off main
power at the main breaker panel.
a. Remove control box cover.
b. Remove the screws holding the lower finger boards to the lower terminal.
c. On the wires connecting to the board on the left, it's easy to mix up the wires.
So note which wires go to which connection. It would make sense to label the
wires. Unplug the transformer wire to the board.
d. Unplug the pressure switch and both sensor wire connections to the board.
Disconnect topside phone type plug.
e. The board is now held to the control box by 4 nylon posts and sometimes one
screw. IF there is a screw, remove and save. To release the board from the nylon
post: there is a clip on the post. Press the clip toward the middle of the post and
pull the board toward you. Do this for all posts and the board will release. To
install, reverse.