Daikin R51NUY1 User Manual

Pocket
Manual
Service Diagnosis
Si20 - 701_B

Daikin R51NUY1 Specifications

General

Brand	Daikin
Model	R51NUY1
Category	Air Conditioner
Language	English

Summary

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

Troubleshooting steps for scenarios where the indoor fan runs but the compressor does not.

2.4 Cooling / Heating Operation Starts but Stops Immediately

Addresses issues where the cooling or heating operation starts and then stops abruptly.

2.6 Equipment Operates but does not Provide Cooling

Steps to diagnose why equipment operates but fails to provide adequate cooling.

2.7 Equipment Operates but does not Provide Heating

Steps to diagnose why equipment operates but fails to provide adequate heating.

Troubleshooting by Remote Controller

3.1 Procedure of Self-diagnosis by Remote Controller

Outlines the method for performing self-diagnosis using the remote controller.

3.2 Error Codes and Description

Lists and describes various error codes for indoor and outdoor units.

3.3 Detailed Error Codes

Provides detailed explanations and diagnostic steps for specific error codes.

3.4 A0 Error of External Protection Device

Troubleshooting for error code A0 related to external protection device activation.

3.5 A1 Indoor Unit PCB Abnormality

Diagnosing and resolving issues related to indoor unit PCB abnormalities (Error A1).

3.7 A6 Indoor Unit Fan Motor Abnormality

Diagnosing abnormalities and failures related to the indoor unit fan motor (Error A6).

3.10 A8 Abnormal Power Supply Voltage

Troubleshooting abnormal power supply voltage conditions (Error A8).

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

Resolving transmission errors between indoor unit PCB and fan PCB (Error C1).

3.21 E0 Actuation of Safety Device

Troubleshooting for safety device actuation errors (Error E0).

3.23 E1 Outdoor Unit PCB Abnormality

Diagnosing and resolving outdoor unit PCB abnormalities (Error E1).

3.24 E3 High Pressure System Abnormality

3.28 E4 Low Pressure System Abnormality

3.32 E5 Compressor Motor Lock

3.35 E9 Electronic Expansion Valve Abnormality

3.40 F6 Refrigerant Overcharged

3.41 H3 High Pressure Switch Abnormality

3.43 H4 Low Pressure Sensor System Abnormality

3.44 H7 Outdoor Unit Fan Motor Signal Abnormality

3.45 H9, J3, J5, J6, J7, J8 Thermistor System Abnormality

3.56 L1 Outdoor Unit PCB Abnormality

3.61 L5 Overcurrent of DC Output (Instantaneous)

3.66 (L8) Electronic Thermal Switch (Time Lag)

3.70 L9 Stall Prevention (Time Lag)

3.71 L9 Inverter Startup Error

3.72 LC Transmission Error Between Inverter and Control PCB

3.73 LC Transmission Error (between Control PCB and Inverter PCB)

3.74 P1 Inverter Over-Ripple Protection

3.75 P1 Open Phase or Power Supply Voltage Imbalance

3.83 U0 Refrigerant Shortage

3.86 U1 Reverse Phase

3.87 U2 Insufficient Voltage

3.91 U3 Check Operation is not Executed

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

3.94 U5 Transmission Error Between Indoor Unit and Remote Controller

3.95 U7 Transmission Error Between Outdoor Units

3.96 U8 Transmission Error Between Main Remote Controller and Sub Remote Controller

3.97 U9 Transmission Error Between Indoor and Outdoor Units in the Same System

3.99 UA Improper Combination of Indoor and Outdoor Units, Indoor Units and Remote Controller

3.101 UA Field Setting Switch and Transmission Line Abnormality

3.104 UE Transmission Error between Centralized Controller and Indoor 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

3.108 UF Transmission System Abnormality (between Indoor and Outdoor Units)