Error Code: EC C1 – Other IDU Refrigerant Sensor Detects Leakage (Multi-zone)

Error Code: EC C1 – Other IDU Refrigerant Sensor Detects Leakage (Multi-zone)

What this means:
In a multi-zone setup, this error means that another indoor unit (not the current one) has detected a refrigerant leak. This unit is simply displaying the alert because the system is interconnected. The error originates from a separate indoor unit’s sensor.

Try this first (quick reset):

1. Turn off power to the entire system.

2. Wait 2 full minutes.

3. Turn the system back on and check all indoor unit displays.

• If the EC C1 error disappears — the alert may have been temporary.

• If the error returns — identify the indoor unit that originally detected the leak.

Next steps (for technicians):

1. Find the source unit:

   • Inspect all indoor units connected to the system.

   • Locate the unit displaying EH C1, which signals the actual refrigerant leak detection.

2. Check for signs of refrigerant leakage on that unit:

   • If confirmed → repair the leak and recharge the system.

3. If no leak is detected:

   • Evaluate the sensor and wiring on the detecting unit.

   • Replace sensor if abnormal.

   • Clear system memory or allow leak-free operation for at least 2.5 hours for reset.

What you might need:

• Leak detection tools

• Refrigerant

• Sensor (on the detecting IDU)

• Wiring repair tools

Helpful tip:
This error does not originate from the current unit. It simply reports a fault triggered by another indoor unit in the system. Always identify the zone that triggered the initial EH C1 alert before troubleshooting.

Click here to view the detailed guide.TS35