Detailed Answer
Zero-position start (zero-position protection): if the transmitter detects a key pressed at power-on, it refuses to start and alarms, preventing accidental actuation at power-up (e.g., remote in a bag with a key pressed). LDER LD series and Xingjia both have it. Test: hold a key pressed before power-on; the transmitter should alarm and not operate.
| Principle | Check keys at power-on |
| Purpose | Prevent power-on actuation |
| Test | Press key + power on |
Note:Before power-on, check that no key on the remote is pressed.