Display shows E10; opener may not respond to wall control or may behave erratically.

Safety: Turn off power to the opener before working on low‑voltage wiring.

• 1. Disconnect wall control wires: Remove the two wall button wires from the Sommer control board terminals. Restore power and see if E10 clears.
• 2. Inspect wall station: Open the wall button housing and check for corrosion, water damage, or crushed wires. Replace the wall station if contacts are shorted or badly corroded.
• 3. Check cable run: Follow the cable from the opener to the wall station. Look for staples driven too tightly, cuts, or splices. Replace damaged cable with similar gauge low‑voltage wire.
• 4. Test with a jumper: At the opener, briefly short the wall button terminals with a small insulated jumper wire. If the door operates normally and no E10 appears, the wiring or wall station is at fault.
• 5. Reconnect or replace: Install a new Sommer‑compatible wall control if needed and reconnect wires with correct polarity if specified.