Motorlift opener display shows E7; wall control and safety sensors may behave erratically.

Safety first: Disconnect power before working on wiring. Use caution on ladders.

Steps to isolate and repair:

• Disconnect accessories: At the opener terminal strip, remove both the wall control and safety sensor wires.
• Power up and test: Plug in the opener. If E7 clears with no wires connected, the short is in the external wiring or devices.
• Reconnect one circuit at a time: First reconnect the safety sensors and test. If E7 returns, the sensor wiring or sensors are shorted. If not, reconnect the wall control and test again.
• Inspect wiring runs: Follow the suspect wire run and look for staples through the cable, pinched sections, or moisture damage. Replace damaged wire.
• Replace faulty device: If wiring is good but E7 appears when a device is connected, replace the Motorlift safety sensors or wall control as appropriate.
• If E7 remains with all wires removed: The low-voltage circuit on the logic board is likely damaged; replace the logic/control board.