Error Code: EC 54 – Compressor Discharge Temperature Sensor (TP) Error

Error Code: EC 54 – Compressor Discharge Temperature Sensor (TP) Error

What this means:
The TP sensor, which monitors the compressor discharge temperature, is either reading out of range or is not responding. This can be caused by a disconnected wire, short circuit, or a failed sensor. The system shuts down to protect the compressor.

Try this first (quick reset):

1. Turn off power to the unit completely.

2. Wait 2 full minutes.

3. Turn the system back on and check if the error clears.

• If the error clears — the issue may have been temporary.

• If the error remains — proceed with the steps below.

Next steps (for technicians):

1. Check the wiring connection:

   • Ensure the TP sensor is properly connected to the outdoor PCB.

   • Repair or replace any loose or damaged wires.

2. Measure the sensor’s resistance:

   • If the resistance is out of range → replace the TP sensor.

   • If the resistance is normal → continue to step 3.

3. If sensor and wiring are fine but error remains:

   • Replace the outdoor main PCB.

What you might need:

• TP (discharge temperature) sensor

• Outdoor main PCB

• Connection wires

Helpful tip:
For certain models, T3, T4, and TP are part of the same combination sensor. Always confirm your unit’s configuration before replacing individual parts. This error is triggered when the sensor voltage is below 0.06V or above 4.94V.

Click here to view the detailed guide.TS05-ODU