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Daikin
Air Conditioner
R42NUY1
Daikin R42NUY1 User Manual
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Manual
Service Diagnosis
Si20 - 7
01_B
2
Table of Contents
Default Chapter
2
Table of Contents
2
1 List of Applicable Models
8
R-FU Series
8
R-GA Series
9
R-G Series
9
R-KU Series
10
R-LU Series
11
2 Symptom-Based Troubleshooting
36
2.1 Overview
36
Applicable Model
38
Supposed Causes
38
2.2 Equipment Does Not Operate
38
Troubleshooting
39
Indoor Unit Fan Operates, but Compressor Does Not Operate
40
Cooling / Heating Operation Starts but Stops Immediately
43
After Unit Shuts Down, It Cannot be Restarted for a While
45
Equipment Operates but Does Not Provide Cooling
48
Equipment Operates but Does Not Provide Heating
51
Equipment Discharges White Mist
54
Equipment Produces Loud Noise or Vibration
56
2.10 Equipment Discharges Dust
59
Remote Controller LCD Displays "88
60
3 Troubleshooting by Remote Controller
61
Procedure of Self-Diagnosis by Remote Controller
61
Wired Remote Controller
62
Hecking an Error or Warning
62
Wireless Remote Controller
63
Taking Corrective Action
63
3.2 Error Codes and Description
66
Outdoor Unit, System
69
Inverter Series
71
3.3 Detailed Error Codes
80
A0 Error of External Protection Device
86
Method of Error Detection
86
Error Decision Conditions
86
A1 Indoor Unit PCB Abnormality
88
A3 Drain Water Level System Abnormality
90
A6 Indoor Unit Fan Motor Abnormality
93
A6 Fan Motor (M1F) Lock, Overload
103
A7 Swing Flap Motor Abnormality / Lock
105
A8 Abnormal Power Supply Voltage
107
A9 Electronic Expansion Valve Coil (Y1E) Abnormality
109
AF Drain System Abnormality
112
AF Drain Level above Limit
114
AJ Capacity Setting Abnormality
115
Remote Controller Display
117
C1 Transmission Error (between Indoor Unit PCB and Fan PCB)
122
C1 Transmission Error (between Indoor Unit PCB and Adaptor PCB)
125
C4, C5, C9 Thermistor Abnormality
128
C6 Defective Combination (between Indoor Unit PCB and Fan PCB)
130
CC Humidity Sensor System Abnormality
132
CJ Remote Controller Thermistor Abnormality
135
E0 Actuation of Safety Device
137
E0 Activation of Outdoor Unit Protection Device
145
E1 Outdoor Unit PCB Abnormality
147
E3 High Pressure System Abnormality
150
E3 Abnormally High Pressure Level (HPS)
155
E3 High Pressure Abnormality (HPS)
157
E3 Actuation of High Pressure Switch
160
E4 Low Pressure System Abnormality
169
E4 Actuation of Pressure Sensor
171
E4 Actuation of Low Pressure Sensor
175
E4 Low Pressure System Abnormality
180
E5 Compressor Motor Lock
183
E6 Compressor Overcurrent
188
Approximate Input Current Value
190
E7 Outdoor Unit Fan Motor Abnormality
191
E9 Electronic Expansion Valve Abnormality
203
E9 Electronic Expansion Valve Coil Abnormality
207
F3 Discharge Pipe Temperature Abnormality
217
F3 Discharge Pipe Temperature Control
225
F6 Abnormal Heat Exchanging Temperature
227
F6 Refrigerant Overcharged
229
H3 High Pressure Switch Abnormality
231
H3 High Pressure Switch System Abnormality
236
H4 Low Pressure Sensor System Abnormality
238
H7 Outdoor Unit Fan Motor Signal Abnormality
242
H9, J3, J5, J6, J7, J8 Thermistor System Abnormality
244
H9 Outdoor Air Thermistor System Abnormality
246
J1 Pressure Sensor Abnormality
248
J2 Current Sensor System Abnormality
250
J3 Discharge Pipe Thermistor System Abnormality
252
J5 Suction Pipe Thermistor Abnormality
255
J6 Heat Exchanger Thermistor System Abnormality
257
J7 Liquid Pipe Thermistor Abnormality
259
J9 Subcooling Heat Exchanger Gas Pipe Thermistor Abnormality
261
JA High Pressure Sensor Abnormality
263
JC Suction Pipe Pressure Sensor Abnormality
266
L1 Outdoor Unit PCB Abnormality
268
L1 Outdoor Inverter PCB Abnormality
270
L1 Outdoor Unit PCB Abnormality
272
L4 Overcurrent of DC Output (Instantaneous)
275
L4 Radiation Fin Temperature Rise
277
Radiation Fin Temperature Detection Value
279
L5 Overcurrent of DC Output (Instantaneous)
285
L5 Momentary Overcurrent of Inverter Compressor
288
L5 Output Overcurrent Detection
291
L5 Inverter Compressor Abnormality
294
L5 Output Overcurrent Detection
297
(L8) Electronic Thermal Switch (Time Lag)
301
L8 Inverter Current Abnormality
304
L8 Inverter Compressor Overcurrent
307
L8 Electronic Thermal (Time Lag)
310
L9 Stall Prevention (Time Lag)
316
L9 Inverter Startup Error
318
LC Transmission Error between Inverter and Control PCB
324
LC Transmission Error (between Control PCB and Inverter PCB)
330
P1 Inverter Over-Ripple Protection
333
P1 Open Phase or Power Supply Voltage Imbalance
336
P4 Radiation Fin Thermistor Abnormality
338
P4 Radiation Fin Thermistor or Related Abnormality
342
PJ Defective Capacity Setting
343
PJ Error in Capacity Setting
345
PJ Field Setting Error after Replacing Main PCB or Defective Combination of PCB
346
PJ Defective Combination of Inverter and Fan Driver
348
PJ Defective Capacity Setting
350
U0 Refrigerant Shortage
354
U0 Low Pressure Drop Due to Refrigerant Shortage or Electronic Expansion Valve Failure
356
U0 Refrigerant Shortage
359
U1 Reverse Phase
365
U2 Insufficient Voltage
368
U2 Power Supply Voltage Abnormality
370
U2 Power Supply Insufficient or Instantaneous Failure
372
U2 Power Supply Voltage Abnormality
377
U3 Check Operation Is Not Executed
380
U4 or UF Transmission Error (between Indoor Unit and Outdoor Unit)
382
U4 Transmission Error between Indoor Unit and Outdoor Unit
388
U5 Transmission Error between Indoor Unit and Remote Controller
411
U7 Transmission Error between Outdoor Units
419
U8 Transmission Error between Main Remote Controller and Sub Remote Controller
422
U9 Transmission Error between Indoor and Outdoor Units in the same System
428
UA Defective Field Setting Switch
431
UA Improper Combination of Indoor and Outdoor Units, Indoor Units and Remote Controller
434
UA Field Setting Switch Abnormality
437
UA Field Setting Switch and Transmission Line Abnormality
440
UC Centralized Address Setting Error
444
UC Address Duplication of Centralized Controller
445
UE Transmission Error between Centralized Controller and Indoor Unit
446
UF Mis-Connection of Field Wiring
454
UF System Is Not Set yet
455
UF Transmission Error between Indoor and Outdoor Unit / Piping and Wiring Mismatch / Refrigerant Shortage
457
Outdoor Units
458
UF Transmission System Abnormality (between Indoor and Outdoor Units)
462
UH System Error, Refrigerant System Address Undefined
463
Check for Fan Motor Connector (Signal Line)
466
3.110 Check
466
Check for Fan Motor Connector (Power Supply Line)
467
Thermistor Resistance / Temperature Characteristics
468
Evaluation of Abnormal High Pressure
471
In Cooling Operation
471
In Heating Operation
472
Evaluation of Abnormal Low Pressure
473
Check for Power Transistor
475
Voltage Measuring Method
477
Pressure Sensor for Except RZQ(S)-B, RZQ-C7 and CMSQ
478
Pressure Sensor for RZQ(S)-B, RZQ-C7 and CMSQ
479
Electronic Expansion Valve Connector and Coil Resistance Criteria
480
Check for Factors Causing Wet Operation
481
Check for Excessive Refrigerant Charging
482
Check for Clogged Points
484
Check for Inadequate Refrigerant
485
Diagnosis of Inadequate Refrigerant
487
Fan Motor Pulse Check
489
Check for Causes of Rise in High Pressure
490
Check for Causes of Drop in Low Pressure
492
Method of Checking Inverter’s Power Transistors and Diode Modules
495
Electronic Circuit
496
Power Module Checking
497
Diode Module Checking
498
Broken Wire Check of the Connecting Wires
499
Warning
501
4
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Daikin R42NUY1 Specifications
General
Model
R42NUY1
Category
Air Conditioner
Cooling Capacity
4.2 kW
Refrigerant
R32
Outdoor Unit Weight
32 kg
Power Supply
220-240V, 50Hz
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