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 spinning too fast or too slow for a consistent period. When its speed operates outside the expected range, the unit shuts down to prevent damage to the system. This can be caused by a faulty fan motor, damaged wiring, or a failing outdoor PCB.

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 if the error clears.

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

• If the error returns — continue with the steps below.

Next steps (for technicians):

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

   • If it does not spin freely → check for physical blockages or motor failure.

2. Check fan motor wiring:

   • Inspect all connections to the fan motor.

   • If wiring is incorrect or damaged → repair or rewire.

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

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

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

   • Pin 5 (Yellow – Vsp): 0–6.5V

   • If voltages are outside this range → replace the outdoor main PCB.

4. If fan uses UVW terminals (motor chip is in PCB):

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

   • If values are not equal → replace the fan motor.

   • If resistance is normal but error persists → replace the PCB.

What you might need:

• Outdoor fan motor

• Outdoor fan assembly

• Outdoor PCB

• Connection wires

Helpful tip:
Always check fan resistance and voltage before replacing major components. Many EC 07 faults come from simple wiring or debris-related issues.

Click here to view the detailed guide.TS16