Error Code: EC 07 – Outdoor Fan Speed Out of Control

Error Code: EC 07 – Outdoor Fan Speed Out of Control

What this means:
The outdoor fan is running at a speed that’s outside the normal range — either too fast or too slow — for an extended time. This can be caused by a faulty fan motor, wiring issue, or a problem with the outdoor PCB. When this happens, the system shuts down to prevent damage.

Try this first (quick reset):

1. Turn off power to the unit completely.

2. Wait 2 full minutes.

3. Turn it back on and check the display.

• If the error clears — the system is back to normal.

• If the error returns — follow the steps below.

Next steps (for technicians):

1. Manual check:

   • With power off, rotate the fan by hand.

   • If it doesn't spin freely → inspect for debris, mechanical blockage, or worn bearings.

2. Check fan motor wiring:

   • Confirm all connections are secure and correctly placed.

   • Fix or replace any loose or damaged wires.

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

   • For DC fans:

     • Pin 1 to Pin 3: 192V–380V

     • Pin 4 to Pin 3: 13.5–16.5V

     • Pin 5 (Vsp): 0–6.5V

   • If readings are incorrect → replace the outdoor PCB.

4. Check resistance (for motors with UVW wires):

   • U–V, U–W, V–W should show equal resistance.

   • If resistance values are off → replace the fan motor.

What you might need:

• Fan motor

• Outdoor fan assembly

• Outdoor PCB

• Connection wires

Helpful tip:
Abnormal fan speed is often caused by motor failure or blocked airflow. Always start with a manual spin test and voltage check before replacing the board.

Click here to view the detailed guide.TS04-ODU