A11
Wolf Communication Fault Between Boiler PCB and Controller

Boiler shows A11, burner does not start, control panel unresponsive to heat demand

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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

Faulty eBUS communication cable, Incorrect polarity or wiring of Wolf controller, Defective main control board, External control (e.g. building management system) wiring fault

How to Fix / Troubleshooting

Safety: Turn off power before working on wiring.

  • Check controller display: Ensure the Wolf room controller or BM-2 module is powered and not showing its own error.
  • Inspect eBUS wiring: Verify that the low-voltage communication cables are firmly connected and not damaged. Follow Wolf wiring diagrams for correct polarity.
  • Test boiler in local mode: If possible, disconnect external controls and run the boiler using its local test or manual mode (technician task).
  • Technician diagnosis: A professional can check bus voltage, continuity, and replace the PCB or controller if required.
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Repair Difficulty

Hard 4/5

Required Part

Main Control Board (PCB)
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