E06
Rheem
Communication Failure Between Rheem Pump and Control Interface
Controller shows E06 communication error; pump does not respond to external automation or keypad commands.
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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
Disconnected or reversed RS‑485 communication wires, Corroded low‑voltage terminal block on Rheem control, Incorrect protocol or address settings, Failed communication interface on control board
How to Fix / Troubleshooting
Safety First: Turn OFF all power to the pump and automation system before handling low‑voltage wiring.
- Verify wiring connections: Open the Rheem control panel and locate the communication terminals (often labeled A/B or +/−). Ensure wires are firmly clamped, not frayed, and polarity matches the external controller.
- Inspect for corrosion: Look for green/white corrosion on the low‑voltage terminals. Clean gently with contact cleaner and a small brush, then retighten.
- Check settings: Using the Rheem keypad, confirm the communication protocol (e.g., RS‑485, Modbus) and address match the pool automation system requirements.
- Test with local control: Disconnect external automation temporarily and attempt to run the pump from the Rheem keypad only. If it runs locally but E06 appears only with automation connected, the issue is in the external controller or wiring.
- Replace control board if needed: If wiring and settings are correct and E06 persists even in standalone mode, the Rheem control board communication circuit may be defective and require replacement.
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Repair Difficulty
Medium
3/5
Required Part
Rheem Pump Control Module
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