Error Code: EC 71 – Overcurrent Failure of Outdoor DC Fan Motor

Error Code: EC 71 – Overcurrent Failure of Outdoor DC Fan Motor

What this means:
The outdoor DC fan motor is drawing too much current, which can result from physical blockage, motor failure, wiring issues, or a defective PCB. The unit shuts down to prevent circuit or component damage.

Try this first (quick reset):

1. Turn off power to the unit completely.

2. Wait 2 full minutes.

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

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

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

Next steps (for technicians):

1. Manually rotate the outdoor fan:

   • If it does not spin freely, inspect for obstructions or bearing issues.

   • Resolve any mechanical blockages.

2. Check the fan motor wiring:

   • If improperly wired → correct the connections.

   • If damaged → repair or replace wires.

3. Measure fan motor voltage (DC motor with internal chip):

   Pin	Wire Color	Signal	Voltage Range
   1	Red	Vs/Vm	192–380V
   3	Black	GND	0V
   4	White	Vcc	13.5–16.5V
   5	Yellow	Vsp	0–6.5V (speed signal)
   6	Blue	FG	13.5–16.5V

   • If any voltage is out of range → replace the main PCB.

4. If fan motor uses UVW wiring (chip on PCB):

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

   • If readings are unequal → replace the fan motor.

   • If readings are equal → replace the PCB.

What you might need:

• Outdoor fan motor

• Outdoor main PCB

• Fan assembly

• Connection wires

Helpful tip:
EC 71 and EC 07 share the same diagnosis tree. Always check both physical and electrical behavior of the fan before replacing components.

Click here to view the detailed guide.TS16