E06
De Dietrich BUS Communication Fault

Boiler displays E06, communication error with remote controller or cascade manager

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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

Broken BUS cable between De Dietrich boiler and controller, Incorrect BUS polarity, Too many devices on BUS without proper addressing, Faulty controller

How to Fix / Troubleshooting

Safety: Isolate power before working on low‑voltage BUS wiring.

Steps:

  • Check cable: Inspect the BUS cable for damage, loose terminals, or reversed polarity (A/B swapped).
  • Reduce devices: If multiple devices are connected, temporarily disconnect all but one to see if communication is restored.
  • Restart system: Power down both boiler and controller, then power up the boiler first, followed by the controller.

Professional help: BUS diagnostics and addressing should be done by a technician familiar with De Dietrich control systems.

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Repair Difficulty

Medium 3/5

Required Part

Room Controller BUS Module
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