APsystems DS3-L / ECU-R Offline — Production OK, Monitoring Restored

Post Date:  •  Incident Date: January 10, 2026

Equipment

  • Microinverters: APsystems DS3-L
  • Monitoring Unit: ECU-R
  • Communication: Wi-Fi

Reported Issue

System appeared offline in the monitoring app, raising concern that solar production had stopped.

What This Usually Means

When Wi-Fi is interrupted:

  • ECU-R loses connection to the router
  • Monitoring stops reporting data
  • Solar production continues normally

This is a communication issue, not a generation failure.

Solution: ECU-R System Reset

Step-by-Step Reset Procedure

  1. Disconnect power to:
    • ECU-R
    • Internet router
  2. Wait 30 seconds
  3. Restore power to both devices
  4. Use a pin or paperclip to press the reset button on the ECU-R for 15 seconds

Allow up to 2 hours for full reconnection.

If Reset Does Not Work

Contact APsystems Support at 844-279-8600 and request:

  • System resynchronization
    (This resends communication commands from the ECU-R to the DS3-L microinverters.)

If resync fails, a service visit may be required.

Final Result

  • Monitoring data restored
  • No impact on solar production
  • No hardware replacement

Key Takeaway
An offline APsystems dashboard almost always points to a communication issue. Reset and resynchronization resolve the vast majority of cases.

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