5202 <1400> (F3) Low pressure sensor (63LS) trouble

What does 5202 <1400> (F3) mean?

This error points to a problem with the low pressure sensor in the outdoor unit. It could be due to a faulty sensor, refrigerant leakage causing pressure drop, or issues with connections or the circuit board.

• Defective low pressure sensor.
• Decrease of internal pressure caused by gas leakage.
• Disconnection or contact failure of the sensor connector.
• Malfunction of input circuit on outdoor multi controller circuit board.

Click steps to track your progress.

1. 1

   Turn off the power to the outdoor unit at the circuit breaker for at least 5 minutes, then turn it back on.

2. 2

   Ensure the low pressure sensor (63LS) connector on the outdoor unit's circuit board is firmly in place.

3. 3

   Look for any signs of refrigerant leakage around the outdoor unit.

4. 4

   If the error continues, professional assistance will be needed to test the sensor or check for refrigerant leaks.

5. 5

   A technician would typically measure the system pressure and examine the outdoor multi controller circuit board.