Blank Display - Hayward ProLogic Troubleshooting Manual

2. Blank Display/No LEDs (cont.)
ProLogic main boards have a 2amp, permanently installed fuse that protects the local
display circuit. AquaLogic main boards had a 3amp violet ATO style fuse that
protected the local display circuit.
Test fuse Test 3amp fuse
Step 2C
Step 2D
With power OFF, test the 2amp fuse integrated into the With power OFF, test the 3amp fuse, located near the
board. IF this fuse is not present, go to step 2D. IF fuse local display. IF the fuse is bad, replace it (GLX-F3A-
has continuity, proceed to step 2E. IF the fuse is 10PK). IF the fuse has continuity, go to step 2E. NOTE:
damaged, replace the main board (see pg. 17). this style of fuse is only found on AquaLogic systems.
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