Hayward ProLogic Troubleshooting Manual page 24

2. Blank Display/No LEDs (cont.)
If the local display shows a blank display or no lights are illuminated an abrupt power
outage may have been the cause, in this case, resetting the unit may correct this
problem.
Test incoming power Test local display power
Step 2E
Step 2F
*
Turn the main system breaker ON and verify that With power OFF, disconnect display, and restore
120VAC of input power is present. IF no/low voltage, power. Verify, across pins 1 & 3 (left to right) for 5-
correct the source power issue. IF voltage is correct, 11VDC. IF no/low voltage replace main board. IF
proceed to step 2F. correct, replace display (see pg. 17).
NOTE: Verify the main board's input power comes from positions 3 & 4 on the terminal block, which
is labeled "Control Power". The two bottom left terminal blocks are factory installed for SENSE &
DISPENSE OUTPUT POWER ONLY, AND SHOULD NOT BE USED TO POWER THE MAIN SYSTEM
BOARD.
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