Jacuzzi Z Builder Series Mechanics And Repair page 21

Chapter THREE Control System
WE label the "Control System" the box which the electronic control is located and
on some models, the heater.
BOARDS:
Overview:
Circuit boards came into common use in the mid 90's. They are a major
improvement in many ways over the older mechanical spas. They are more
accurate in keeping the proper temperature. They typically will filter automatically
or on some models, are programmable to when and what length of time they will
filter. They also have settings for when you are away so the spa will keep the
water clean yet not stay hot.
How It Works:
Basically the board is computer board and are commonly called a board. They
test various components including pressure/flow switches, temp and OH sensors,
topside, motors, and heaters. Some will notify you when its time to replace the
filter. They are design both to make operation of the spa easier, keep the water
cleaner, and filter the water on a regular basis.
The Steps the Board Takes to Come On:
Circuit boards typically go through the same routine. When you turn on power the
spa does a self test to make sure internally everything is operating properly. On
some models there is a countdown, some have a heater light that stays on
during the self test, some a flickering topside. During this time on a few models,
the circulation pump will turn on.
When the board is going through it test it will look to confirm the board's integrity
is fine. It will look at the temp and OH sensor to confirm they are within tolerance
and close to equal. It will also look at the flow/pressure switch to confirm that the
switch is open. Then it will turn on either the circulation pump, the #1 pump, or the