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

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

What this means:
The indoor fan is running either too fast or too slow for a continuous period, triggering a fault. When fan speed operates outside the normal range, the unit shuts down to protect internal componentsTS21.

Try this first (quick reset):

1. Turn off the power to the system.

2. Wait at least 2 minutes.

3. Turn the system back on and check if the error clears.

• If the error clears — the issue may have been temporary.

• If it returns — continue with the steps below.

Next steps (for technicians):

1. Manually rotate the indoor fan (power off):

   • If it doesn’t spin easily → inspect for physical obstructions or mechanical faults.

2. Check fan motor wiring:

   • If miswired → reconnect properly.

3. Measure voltage from the indoor PCB to the fan motor:

   • Use the following voltage guide:

     • Red (Pin 1) to Black (Pin 3): 192–380V

     • White (Pin 4) to Black (Pin 3): 13.5–16.5V

     • Yellow (Pin 5): 0–6.5V (Vsp signal)

     • Blue (Pin 6): 13.5–16.5V

   • If voltage is outside range → replace the main PCB.

4. If fan motor has UVW terminals (chip on PCB):

   • Measure U–V, U–W, and V–W resistance.

   • If resistance is not equal → replace the fan motor.

   • If resistance is normal → replace the PCB.

What you might need:

• Fan motor

• Fan assembly

• Indoor PCB

• Connection wires

Helpful tip:
Spin test is the simplest first step. If the fan rotates freely but still fails under power, check wiring and voltage before assuming the board or motor needs replacement.

Click here to view the detailed guide.TS21