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’s discharge temperature, is giving a voltage reading outside the normal range. If the sampling voltage falls below 0.06V or rises above 4.94V, the system interprets this as a sensor fault and shuts down.

Try this first (quick reset):

1. Turn off 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 voltage glitch.

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

Next steps (for technicians):

1. Check the wiring between TP sensor and PCB:

   • Ensure all wires are securely connected and undamaged.

   • If faulty → repair or replace the connection wires.

2. Measure resistance of the TP sensor:

   • If the sensor’s resistance is outside normal range → replace the TP sensor.

   • If resistance is within spec but error persists → replace the outdoor PCB.

What you might need:

• TP (discharge) temperature sensor

• Outdoor PCB

• Connection wires

Helpful tip:
In many models, the TP sensor may be part of a combination sensor unit shared with T3 and T4. Always verify your unit’s configuration before ordering replacements.

Click here to view the detailed guide.TS18