RCD Sensor Error — RCD measurement failed

What does 28 mean?

The Residual Current Device (RCD) sensor failed during the inverter's startup test. This sensor is important for detecting ground faults.

• RCD sensor malfunction
• Connection issue with the RCD sensor
• Internal hardware fault

Click steps to track your progress.

1. 1

   Turn off your inverter completely (using the AC disconnect switch), wait for 5 minutes, then turn it back on.

2. 2

   Check your home's main electrical panel and the inverter's dedicated circuit breaker. Ensure all relevant breakers are in the 'ON' position.

3. 3

   Look at the LED indicator lights on your inverter. Note any specific colors or blinking patterns and refer to your inverter's manual for what they indicate regarding system status or errors.

4. 4

   Visually inspect any external cables connected to your inverter for obvious damage or loose connections.

5. 5

   If the RCD Sensor Error persists after trying these steps, please contact SolarEdge customer support or your certified installer for further assistance. Do not attempt to open the inverter yourself.