All LEDs are permanently off

  • There is a problem with the supply voltage.

  • Verify 100-240 VAC.

    If the problem persists, the product may be malfunctioning.

Red LED is permanently on

  • Error on the M-Bus 2-wire bus.

  • Verify no short-circuit of the M-Bus bus. The voltage should be between 24-30 VDC.

Cannot connect to the product using TCP/IP


Verify TCP/IP settings in the internal web interface:

  • TCP port used for communication

  • IP address

  • Ethernet link settings

Cannot read connected M-Bus slaves


Verify M-Bus status:

  • Voltage over M-Bus slave device should be between 24 VDC and 30 VDC.

  • All M-Bus slave devices must have unique secondary or primary M-Bus addresses depending on addressing mode.

  • M-Bus slave device baud rates.

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