LED: CPU Not lit — CPU is without power

What does Not lit CPU mean?

The CPU LED on the base board (AA2) is not lit, indicating that the CPU (Central Processing Unit) is not receiving power.

• Fault with the base board.
• Internal power supply issue on the base board.

Click steps to track your progress.

1. 1

   Check that the green PWR LED is continuously lit, confirming the base board has power.

2. 2

   If the PWR LED is on, try resetting the Heat Pump by briefly disconnecting and reconnecting its main power supply (via circuit breaker).

3. 3

   If the CPU LED remains off, contact a qualified technician to inspect the base board.

4. 4

   Ensure the main product's software is the latest version, if applicable.