Low level programming allows you to set up your spa (2011 through current) for the options that you have.
You can access the low level programming by holding down the settings button for about 20 seconds until the the screen reads LLP.
Once you access the menu, here is a list of what it means:
Pn - # of pumps - set from 1-5
bl - blower (therapy air) - 0 = no blower installed, 1 = blower installed
O3 - Ozone - 0 = no ozone installed, 1 = Peak 1 Ozone installed, 2 = Peak 2 Ozone installed
On - Onzen Saltwater System - 0 = no Onzen including SpaBoy, 1 = Onzen installed
FS - Filtration Suspend - 0 = off, 1 = on. Filtration system will stop filtration if the current temperature is 2 degrees above the setpoint temperature
IP - IP Address - dy - dynamic. You should always have it set to dy.
.### - this is your current ip address if you are connected to the internet
bS - Breaker Size - set this number for the size of the breaker that feeds your hot tub
FL - Flashing Lights - 0 = off, 1 = on. Flashing lights will blink when there is an error code on the topside to alert you
FG - 0 = off - leave this at 0
Sb - Spa Boy - 0 = not installed, 1 = installed, 2 = manual mode.
Here is a video to show this process:
Low Level Programming