Safety: Disconnect power before touching any wiring or circuit boards.

1. Power reset: Unplug the opener for at least 60 seconds, then plug back in. Observe if E7 clears.
2. Disconnect accessories: Remove all low‑voltage connections from the control board (wall button, key switch, external receiver, photo eyes) except the minimum required safety sensors. Reapply power and check if E7 disappears.
3. Inspect for shorts: Look for crushed or pinched low‑voltage wires, especially where they pass through metal brackets or staples. Repair or replace damaged wiring.
4. Surge protection: If E7 appeared after a storm or outage, inspect the board for burn marks or swollen components. In this case, replacement of the control board is usually required.
5. Reconnect accessories one by one: After E7 clears, reconnect each accessory and test to identify any device that re‑triggers the fault.

If E7 remains with all accessories disconnected, the control board is defective and must be replaced.

Sommer opener display shows E7 and the unit will not respond to open/close commands.

Possible Causes