Error Code: EC 5E – Condenser Temperature Sensor (T3B) Failure

Error Code: EC 5E – Condenser Temperature Sensor (T3B) Failure

What this means:
The T3B sensor, which monitors the temperature at the outdoor condenser, is either shorted, disconnected, or returning an abnormal voltage. If the sampling voltage is below 0.06V or above 4.94V, the system triggers EC 5E and shuts down.

Try this first (quick reset):

1. Turn off power to the system completely.

2. Wait 2 full minutes.

3. Turn the unit back on and check the display.

• If the error clears — it may have been a temporary wiring or voltage issue.

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

Next steps (for technicians):

1. Check the connection between the T3B sensor and the PCB:

   • Make sure the sensor wiring is properly connected and undamaged.

   • Repair or replace the wires if necessary.

2. Measure the resistance of the T3B sensor:

   • If the resistance is not within range → replace the sensor.

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

What you might need:

• T3B condenser temperature sensor

• Connection wires

• Outdoor PCB

Helpful tip:
This error is part of a broader group of temperature sensor faults (like EC 52–EC 57). Always verify wiring and resistance first before replacing control boards.

Click here to view the detailed guide.TS18