Error Code: EH 03 – IDU Fan Speed Out of Control

Error Code: EH 03 – IDU Fan Speed Out of Control
Applies to LETO and AURA Series

What this means:
The indoor fan is spinning too fast or too slow and not staying within the normal speed range. This can be caused by a faulty fan motor, a wiring issue, or a problem with the control board.

Try this first (easy fix):

1. Turn off the 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 — your system is back to normal.

• If the error returns — continue below.

Next steps (for technicians):

• Manually spin the fan with the power off. If it doesn't spin freely, check for blockages or mechanical faults.

• Inspect and correct wiring connections to the fan motor.

• If wiring is good and the fan spins freely, test voltage to the fan motor from the indoor PCB.

• If voltages are outside the normal range, the indoor main PCB may be faulty.

What you might need:

• Fan motor

• Fan assembly

• Connection wires

• Indoor main PCB

Helpful tip:
A fan that doesn’t turn easily or receives incorrect voltage signals from the board can trigger this error. If unsure how to test voltages or check motor resistance, contact a certified technician.

Click here to view the detailed guide. TS04-S-IDU