E09
DAB
Communication Error (RS‑485 / External Control Interface)
Pump shows E09 and cannot communicate with external controller (e.g. pool automation system)
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Incorrect wiring of RS‑485 terminals on DAB control, Reversed polarity on communication lines, Broken or shorted communication cable, Faulty communication port on DAB control module
How to Fix / Troubleshooting
Safety first: Turn off power before adjusting any wiring.
Steps to check:
- Verify wiring: Open the DAB control box and locate the communication terminals (often marked A/B or +/−). Confirm they match the external controller's wiring diagram.
- Check cable integrity: Inspect the communication cable for cuts, kinks, or water ingress at junction boxes. Replace if suspect.
- Polarity and termination: Ensure RS‑485 polarity is correct and that termination resistors are installed as per DAB and automation manufacturer instructions.
- Standalone test: Disconnect external control and run the pump in local/manual mode. If it runs normally, the issue is limited to the communication interface.
- If E09 persists with correct wiring: The communication interface on the DAB control module may be defective and require replacement.
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Repair Difficulty
Medium
3/5
Required Part
DAB control module communication board
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