Error Code: EH C3 – Refrigerant Sensor is Out of Range

Error Code: EH C3 – Refrigerant Sensor is Out of Range

What this means:
This error is triggered when the indoor unit receives no feedback from the refrigerant sensor for 150 seconds, or when it receives a fault signal for 10 seconds. It means the sensor is out of range or not responding at allTS36.

Try this first (quick reset):

1. Turn off the system power completely.

2. Wait 2 full minutes.

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

• If the error clears — monitor to ensure it doesn’t return.

• If the error returns — begin checking the sensor and its wiring.

Next steps (for technicians):

1. Inspect wiring between refrigerant sensor and indoor PCB:

   • Ensure all wires are properly connected.

   • Repair or reseat any loose connections.

2. If wiring is correct and the issue remains:

   • Replace the refrigerant sensor.

3. If replacing the sensor does not resolve the issue:

   • Replace the indoor main PCB.

What you might need:

• Refrigerant sensor

• Indoor main PCB

• Connection wires

Helpful tip:
This fault is often misdiagnosed as a refrigerant leak, but EH C3 specifically indicates a sensor signal problem — not a confirmed leak. Always check wiring before replacing components.

Click here to view the detailed guide.TS36