PWR (green) LED not lit - Base board without power

What does PWR LED off mean?

The green PWR LED on the base board (AA2) is off, indicating that the main control board is not receiving power. The Heat Pump cannot operate without power to the base board.

• No incoming electrical supply to the Heat Pump.
• Tripped fuse or circuit breaker.
• Internal wiring fault to the base board.

Click steps to track your progress.

1. 1

   Check if the main power switch for the NIBE S2125 Heat Pump is ON.

2. 2

   Verify that the group and main fuses for your accommodation are not tripped.

3. 3

   Ensure the Heat Pump’s fuse/automatic protection (F1, F2, F3, F4, FC1 / FB1) are intact and not blown.

4. 4

   If power issues persist, contact a qualified electrician or NIBE service technician.