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2
Operation 
Refer to the Pro Logic or Aqua Logic Operation Manual for complete AQL-WW-P-4 operating in-
structions. 
Start-up
When power is turned on, the display backlight should immediately illuminate and the following 
display should appear for a few seconds:
The x.xx is the software revision level for this particular display/keypad.
Troubleshooting
1. Display/keypad not functioning (no display, no LEDs illuminated)
If the display/keypad located on the main unit is working correctly, the most likely cause is that wires 
1 and 4 are either open circuited or reversed. Check wiring. If none of the displays are working, 
check that 120V power is being applied to the main control and that the 3A fuse (violet) is not blown.
2. “Communication Error” displayed
If the display/keypad on the main unit is working correctly, the most likely cause is that wires 2 and 
3 are either open circuited or reversed. If all the display/keypads are showing “Communication Er-
ror”, unplug the remote display connector at the main unit and check the main display. If the main 
display works properly, the problem is in the wiring or one of the remotes is defective. If the main 
display keypad still does not work, the main PCB will have to be replaced.
3. Display backlight turns off after a period of time
The display backlight should always illuminate when you press any key on the unit. If it turns off 
after a period of time, you can stop this by pressing the menu key (possibly multiple times) until 
“Settings Menu” appears. Next press the “<” or “>” key (possibly multiple times) until “Display 
Light” appears. At this point, pressing either “+” or “-“ will allow you to select either “Always On” or 
“Off after 60 sec”. After you have selected the desired operation, press the “Menu” button to lock 
in your setting. Note that this selection applies to this display/keypad only. Repeat the process for 
each display/keypad in the system.
4. Display backlight always on 
The display backlight should always illuminate when you press any key on the unit. If it remains on 
after 60 seconds have elapsed since the last button push, you can stop this by pressing the menu 
key (possibly multiple times) until “Settings Menu” appears. Next press the “<” or “>” key (possibly 
multiple times) until “Display Light” appears. At this point, pressing either “+” or “-“ will allow you 
select either “Always On” or “Off after 60 sec”. After you have selected the desired operation, press 
the “Menu” button to lock in your setting. Note that this selection applies to this display/keypad only. 
Repeat the process for each display/keypad in the system.
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