Error Code: EH C1 – Refrigerant Sensor Detects Leakage

Error Code: EH C1 – Refrigerant Sensor Detects Leakage

What this means:
This error occurs when the refrigerant sensor detects a refrigerant concentration at or above one of two thresholds:

• ≥10% of LFL (Lower Flammability Limit) for at least 10 seconds

• ≥20% of LFL at any time
  It can also be triggered in multi-zone systems when the outdoor unit sends a refrigerant leakage protection fault to all indoor unitsTS37.

Try this first (quick reset):

1. Turn off power to the system.

2. Wait 2 minutes.

3. Turn it back on and observe the display and any audible alarms.

• If the error clears — monitor for recurrence.

• If the error returns — proceed with leak inspection and repairs.

Next steps (for technicians):

1. Check for system blockages:

   • If blockages are found → clear them before restarting.

2. Check for refrigerant leakage:

   • If a leak is detected → repair the leak and recharge the system with refrigerant.

3. If no leak is found but error remains:

   • Reinspect the sensor wiring and control board communication for faults.

Multi-zone model behavior:

• The indoor unit that detects leakage sounds a buzzer for up to 5 minutes.

• Other indoor units will display ECC1 but remain silent.

• Press any button (on remote, wall controller, or app) to silence the alarm.

What you might need:

• Leak detection tools

• Additional refrigerant

• Wiring inspection tools

Helpful tip:
This error may show even when no physical leak is present, due to airflow obstruction, wiring fault, or sensor damage. Always inspect system conditions before clearing the fault.

Click here to view the detailed guide.TS37