Hayward ProLogic Troubleshooting Manual page 27

3. CSM Comm Error (cont.)
The Chemistry Sensing Module plugs into one of the three available communication
ports of the ProLogic (which are located on the top left side of the main board).
Verify wires & connection Test comm port
Step 3C
Step 3D
Verify wire between HL-CHEM and ProLogic, is not While powered, test for 5-10VDC between pins 2 & 4
damaged. Unplug CSM connector from main board & (left to right). IF no/low voltage, replace the main
plug it back in. IF wire/connector is damaged replace board (see pg. 17). IF voltage is correct, replace the
(GLX-SD-ELEC-MOD). IF free of damage, go to step 3D. chemistry sensing module (GLX-SD-ELEC-MOD).
NOTE: If the cable that runs from the HL-CHEM to the ProLogic board is damaged then the
chemistry module MUST be replace. DO NOT attempt to repair damaged cable.
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