Interactive diagnostic wizard for Hayward ProLogic and AquaLogic pool automation systems. Troubleshoot blank displays, communication errors, chlorinator faults, heater relay issues, and auxiliary equipment failures.
Select the symptom your ProLogic is displaying to get step-by-step troubleshooting guidance.
Click a symptom to see diagnostic steps.
This interactive troubleshooting wizard is designed specifically for the Hayward ProLogic and AquaLogic pool automation and salt chlorination systems. These systems control 4-16 high voltage relays, 3-4 valve actuators, 1-2 heaters, and feature an 8-slot 100-amp subpanel. Whether you are a pool homeowner trying to understand an error message or a service technician performing structured diagnostics, this tool adapts to your skill level.
Select the "Homeowner" role for safe, practical checks you can perform yourself, or switch to "Technician" mode for detailed diagnostic procedures including voltage measurements, fuse testing, and relay diagnostics.
The table below summarizes the most common Hayward ProLogic/AquaLogic error conditions and their meanings. Click the troubleshooter above for step-by-step diagnosis of each issue.
| Error / Symptom | Description |
|---|---|
| No Cell Power / Low Volts | Chlorinator cycle interrupted due to no voltage detected when cell power relay turned on |
| Blank Display / No LEDs | Local display is off and no status LEDs are illuminated — power supply, fuse, or display failure |
| CSM Comm Error | Chemistry Sensing Module (HL-CHEM) not found — Sense & Dispense enabled but module disconnected |
| Chlorinator Off — High Salt/Amps | Cell amperage exceeds allowable threshold for the programmed cell model |
| Comm Error 1 | Communication fault after brownout or power outage — typically clears with power cycle |
| Comm Error 2 | Communication fault from incorrect power on comm circuit, local display, or main board issue |
| Heater Not Firing | Heater does not activate when called — relay, wiring, or heater configuration issue |
| Auxiliary Not Running | Equipment wired to an AUX relay does not operate — relay, interlock, or wiring fault |
| Inspect Cell | 500-hour maintenance reminder to inspect and clean the TurboCell |
| Wtr Sensor Short | Water temperature sensor wiring is shorted — check sensor and terminal block connections |
"No Cell Power" means the chlorinator cycle has been interrupted because no voltage was detected when the cell power relay turned on. Start by checking the 20-amp fuse that protects the chlorinator circuit. If the fuse is intact, verify 20-24VAC at the transformer output (yellow wires). If voltage is correct there but the cell still shows no power, inspect the rectifier wiring. If the system reports "CELL POWER ERROR" specifically, the main board (GLX-PCB-PRO) needs replacement.
A blank display often results from a power outage or brownout. First, try power cycling the system by turning off the breaker for 2 minutes and restoring power. If that does not work, with power off, remove the terminal blocks on the left side of the PCB and restore power -- if the display returns, the problem is in the terminal blocks or attached communication equipment. ProLogic boards have a 2-amp integrated fuse protecting the display circuit. AquaLogic boards use a 3-amp violet ATO fuse (GLX-F3A-10PK). Test the appropriate fuse for continuity.
This message indicates the ProLogic detected an amperage draw from the TurboCell that exceeds the allowable threshold for the programmed cell model. First, test the actual salt level with an independent meter. If salt is above 3400 PPM, dilute the pool water. If salt is correct, reset the chlorinator in the Diagnostic Menu and check voltage -- readings above 35V indicate the main board needs replacement. Also verify the correct cell type (T-Cell-3, 5, 9, or 15) is selected in Configuration to match the physically installed cell.
The "Inspect Cell" message appears every 500 operational hours as a maintenance reminder. Before clearing it, inspect and clean the TurboCell if needed. To clear: press Menu until "Default Menu" appears, press the right arrow until "Inspect Cell Hold + to reset" appears, then press and hold the + key. After clearing, if the cell was reading low salt before cleaning, either reset the average salt reading or wait 24 hours for the system to recalibrate.
The ProLogic main board part number is GLX-PCB-PRO and the AquaLogic main board is GLX-PCB-MAIN. The local display part numbers also differ -- ProLogic uses GLX-PL-LOC-XX while AquaLogic uses GLX-LOCAL-XX (where XX indicates the model variant: P4, PS4, PS8, or PS16). AquaLogic boards have a 3-amp violet ATO fuse for the display circuit, while ProLogic boards have a 2-amp permanently installed fuse. Always match replacement parts to your specific system SKU.
Yes. Select the "Homeowner" role and the wizard will show only the checks that are safe and practical for a non-professional to perform. Technician-level steps such as voltage measurements, fuse testing, and relay diagnostics are hidden unless you switch to Technician mode. Always follow the safety warnings on screen, and consult a licensed pool service professional for any repair you are not comfortable performing.
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