Hayward OmniLogic Troubleshooting Manual page 49

3. 24V LED Not Illuminated
The power supply (located in the lower right portion of the cabinet) converts 120VAC
to 12VDC and 24VDC. The 12vDC circuit drives communication and the 24VDC circuit
drives relay activation.
Test PSU output Test PSU input
Step 3A
Step 3B
Check for 12VDC between the black and red (bottom Test between the black and white wires for 120VAC. IF
two) wires and 24VDC between blue and white (top no/low, continue to step 3C. IF voltage is correct, then
two). IF voltage is correct, replace MPP (HLX-PCB- the power supply will need to be replaced
MAIN). IF low/no voltage, go to 3B. (HLX-PSUPPLY).
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