Hormann Accessory or Bus Communication Fault

Operator beeps or flashes a pattern but no 7‑segment code is shown

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.

Possible Causes

Faulty external control (e.g. Hormann gateway, keypad), Shorted bus cable, Incorrect accessory wiring

Safety first: Disconnect power before altering accessory wiring.

Step-by-step:

Disconnect accessories: Remove connections to external keypads, gateways, or bus‑connected devices one by one, testing after each removal.
Inspect cables: Look for damage to low‑voltage bus cables and repair or replace as needed.
Check polarity: Ensure bus wires are connected with correct polarity to the designated terminals.
Replace faulty accessory: If the fault disappears when a specific device is disconnected, replace that device.

Medium 3/5

External Accessory (Keypad, Gateway, Bus Device)

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