Error Code: EC 56 – Indoor Coil Outlet Temperature Sensor (T2B) Error

Error Code: EC 56 – Indoor Coil Outlet Temperature Sensor (T2B) Error

What this means:
This error occurs when the T2B sensor (which monitors the outlet temperature of the indoor coil) is either short-circuited, open-circuited, or providing an abnormal voltage reading. The system will shut down when the sampling voltage falls below 0.06V or above 4.94V.

Try this first (quick reset):

1. Turn off the 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 — it may have been a temporary sensor glitch.

• If the error remains — continue below.

Next steps (for technicians):

1. Inspect the sensor wiring:

   • Make sure the T2B sensor is properly connected to the indoor PCB.

   • If wires are loose or damaged → repair or replace them.

2. Measure sensor resistance:

   • If resistance is outside of the expected range → replace the T2B sensor.

   • If within spec and error still shows → replace the indoor PCB.

What you might need:

• T2B sensor

• Indoor PCB

• Connection wires

Helpful tip:
Sensor-related faults like EC 56 are usually resolved by correcting wiring issues or replacing the sensor. Always test resistance before replacing the PCB.

Click here to view the detailed guide.TS18