Error Code: EH 0b – Indoor Main Board and Display Board Communication Error

Error Code: EH 0b – Indoor Main Board and Display Board Communication Error
Applies to LETO and AURA Series

What this means:
The main control board (indoor PCB) isn’t receiving signals from the display board. This usually means there’s a wiring issue, a faulty display board, or a failure on the main PCB.

Try this first (easy fix):

1. Turn off power to your mini split completely.

2. Wait 2 full minutes.

3. Turn the power back on and check the display.

• If the error is gone — the system is working normally.

• If the error stays — move to the next step.

Next steps (for technicians):

• Check the communication cable between the display board and indoor PCB.

• Ensure all connections are secure and not damaged.

• If wiring is fine:

  • Try replacing the display board.

  • If the error still shows after that, replace the indoor main PCB.

What you might need:

• Display board

• Indoor PCB

• Communication wire

Helpful tip:
Loose connectors or damaged wires are the most common cause of this error. Always start with a wiring check before replacing any components.

Click here to view the detailed guide.TS07