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No LED

No LED on Gateway — No power or hardware issue

Junkers · EMS Gateway

What does No LED mean?

The blue LED on the Gateway is completely off after you plug it into the boiler or connect its power plug. This indicates that the device is not receiving power or might have a hardware problem preventing it from booting.

Common Causes

  • Gateway is not receiving power from the boiler or external adapter.
  • The power plug or cable is not fully inserted or is faulty.
  • Internal hardware issue with the Gateway unit.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check that the power plug is securely connected to the Gateway and the power outlet or boiler service jack.

  2. 2

    Ensure the power source (boiler or external adapter) is functioning correctly.

  3. 3

    If using an external power adapter, try a different, known-good adapter.

  4. 4

    If connected to the boiler, verify the boiler itself is powered on.

Browse all codes in this manual (6)
Verified technical data. Last updated: April 2026

Related Faults

1 flashBlue LED 1 flash (slow blink) — EMS bus not connected2 flashesBlue LED 2 flashes — Network not connected, EMS bus is connected3 flashesBlue LED 3 flashes — EMS bus and network both not connected
Source: Junkers EMS Gateway
Open Manual (Page 29)Search more codes in this manual