Daikin R56NUY2S User Manual

Pocket
Manual
Service Diagnosis
Si20 - 701_B

Daikin R56NUY2S Specifications

General

Model	R56NUY2S
Cooling Capacity	5.6 kW
Heating Capacity	6.3 kW
Refrigerant	R32
Power Supply	220-240V, 50Hz

Summary

2. Symptom-based Troubleshooting

2.2 Equipment does not Operate

Details troubleshooting steps for when the equipment fails to operate.

2.3 Indoor Unit Fan Operates, but Compressor does not Operate

Addresses scenarios where the indoor fan runs, but the compressor does not.

2.4 Cooling / Heating Operation Starts but Stops Immediately

Outlines troubleshooting for operations that start and then stop abruptly.

2.5 After Unit Shuts Down, It cannot be Restarted for a While

2.6 Equipment Operates but does not Provide Cooling

Provides guidance for when the unit operates but fails to cool.

2.7 Equipment Operates but does not Provide Heating

Details troubleshooting for units that operate but do not heat.

3. Troubleshooting by Remote Controller

3.1 Procedure of Self-diagnosis by Remote Controller

Explains the steps for performing self-diagnosis using the remote controller.

3.2 Error Codes and Description

Lists and describes various error codes displayed by the system.

3.3 Detailed Error Codes

3.4 A0 Error of External Protection Device

3.5 A1 Indoor Unit PCB Abnormality

3.7 A6 Indoor Unit Fan Motor Abnormality

3.11 A9 Electronic Expansion Valve Coil (Y1E) Abnormality

3.15 C1 Transmission Error (between Indoor Unit PCB and Fan PCB)

3.21 E0 Actuation of Safety Device

3.23 E1 Outdoor Unit PCB Abnormality

3.24 E3 High Pressure System Abnormality

3.28 E4 Low Pressure System Abnormality

3.32 E5 Compressor Motor Lock

Provides troubleshooting steps for compressor motor lock issues.

3.33 E6 Compressor Overcurrent

Details troubleshooting for compressor overcurrent conditions.

3.34 E7 Outdoor Unit Fan Motor Abnormality

Addresses abnormalities in the outdoor unit fan motor.

3.35 E9 Electronic Expansion Valve Abnormality

3.41 H3 High Pressure Switch Abnormality

3.43 H4 Low Pressure Sensor System Abnormality

3.56 L1 Outdoor Unit PCB Abnormality

3.59 L4 Overcurrent of DC Output (Instantaneous)

Details troubleshooting for instantaneous DC output overcurrent.

3.61 L5 Overcurrent of DC Output (Instantaneous)

Covers troubleshooting for instantaneous DC output overcurrent.

3.62 L5 Momentary Overcurrent of Inverter Compressor

Addresses troubleshooting for momentary overcurrent of the inverter compressor.

3.64 L5 Inverter Compressor Abnormality

Provides troubleshooting for inverter compressor abnormalities.

3.68 L8 Inverter Compressor Overcurrent

Covers troubleshooting for inverter compressor overcurrent.

3.71 L9 Inverter Startup Error

3.72 LC Transmission Error Between Inverter and Control PCB

3.83 U0 Refrigerant Shortage

Covers troubleshooting for refrigerant shortage issues.

3.84 U0 Low Pressure Drop Due to Refrigerant Shortage or Electronic Expansion Valve Failure

Addresses low pressure drop due to refrigerant shortage or EV failure.

3.92 U4 or UF Transmission Error (Between Indoor Unit and Outdoor Unit)

3.105 UF Mis-connection of Field Wiring

3.107 UF Transmission Error between Indoor and Outdoor Unit / Piping and Wiring Mismatch / Refrigerant Shortage