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8th bit

Tcp Connect. Failed — Cannot establish server connection

SolarEdge · Inverters

What does 8th bit mean?

The inverter could not establish a TCP connection with the SolarEdge server. This is a critical communication failure.

Common Causes

  • Network issues preventing TCP connection
  • Server-side problems
  • Incorrect network configuration

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Verify your internet connection is active.

  2. 2

    Check your network settings, including firewall rules.

  3. 3

    Contact your network administrator or internet provider.

Browse all codes in this manual (51)
Verified technical data. Last updated: April 2026

Related Faults

10, 37, 38Ground Current - RCD — High ground currents detected102DC Voltage Too High — Input DC voltage exceeds maximum level103, 119UDC Min / DC Voltage Too Low — Input DC voltage below minimum level
Source: SolarEdge Inverters
Open Manual (Page 68)Search more codes in this manual