Daikin VRV IV+ Service Manual page 7

REYQ8~20+REMQ5U7Y1B
VRV IV+ Heat Recovery
ESIE18-15B – 2020.05
2.3.190 UA-50 – Combination abnormality - High Temperature Hydrobox Detected Connected to a BS Unit ....... 180
2.3.191 UA-51 – Combination abnormality - Only Hydrobox Units Detected ........................................................... 180
2.3.192 UA-53 – Combination abnormality - Branch Selector box Dip Switch Abnormality ..................................... 180
2.3.193 UF-01 – Wiring and piping mismatch - Auto address inconsistency on F1-F2 transmission........................ 181
2.3.194 UF-05 – Wiring and piping mismatch - Stop valves closed or incorrect ....................................................... 182
2.3.195 UF-11 – Wiring and piping mismatch - Excess connection ratio ................................................................... 183
2.3.196 UH-01 – Auto-address failure......................................................................................................................... 183
2.3.197 UH-02 – Auto-address failure......................................................................................................................... 184
2.3.198 E-1 – Refrigerant leak check is not possible................................................................................................... 185
2.3.199 E-2 – Refrigerant leak check cannot be performed - indoor air temperature is out of range ..................... 186
2.3.200 E-3 – Refrigerant leak check cannot be performed - outdoor air temperature is out of range................... 186
2.3.201 E-4 – Refrigerant leak check is interrupted - too low pressure is detected.................................................. 187
2.3.202 E-5 – Refrigerant leak check cannot be performed - a unit which is not compatible with leak detection
function is installed ........................................................................................................................................ 187
2.3.203 NG – Refrigerant leak check function detects refrigerant leak ..................................................................... 188
2.3.204 OK – Refrigerant leak check function detects no refrigerant leak ................................................................ 188
2.3.205 Indoor unit related error codes...................................................................................................................... 188
2.3.206 Overview of error codes................................................................................................................................. 191
2.4 Symptom based troubleshooting ................................................................................................................................... 198
2.4.1 Normal operating conditions ......................................................................................................................... 198
2.4.2 Symptom: The system does not operate....................................................................................................... 198
2.4.3 Symptom: Cool/Heat cannot be changed over ............................................................................................. 199
2.4.4 Symptom: Fan operation is possible, but cooling and heating do not work ................................................ 199
2.4.5 Symptom: The fan speed does not correspond to the setting...................................................................... 199
2.4.6 Symptom: The fan direction does not correspond to the setting................................................................. 199
2.4.7 Symptom: White mist comes out of a unit (Indoor unit) .............................................................................. 199
2.4.8 Symptom: White mist comes out of a unit (Indoor unit, heat exchanger unit)............................................ 199
2.4.9 Symptom: The user interface reads "U4" or "U5" and stops, but then restarts after a few minutes.......... 200
2.4.10 Symptom: Noise of air conditioners (Indoor unit)......................................................................................... 200
2.4.11 Symptom: Noise of air conditioners (Indoor unit, outdoor unit) .................................................................. 200
2.4.12 Symptom: Noise of air conditioners (Outdoor unit)...................................................................................... 200
2.4.13 Symptom: Dust comes out of the unit........................................................................................................... 200
2.4.14 Symptom: The units can give off odours ....................................................................................................... 200
2.4.15 Symptom: The outdoor unit fan does not spin.............................................................................................. 200
2.4.16 Symptom: The display shows "88"................................................................................................................. 201
2.4.17 Symptom: The compressor in the outdoor unit does not stop after a short heating operation ................. 201
2.4.18 Symptom: The inside of an outdoor unit is warm even when the unit has stopped.................................... 201
2.4.19 Symptom: Hot air can be felt when the indoor unit is stopped.................................................................... 201
2.4.20 Symptom: Unit operation problems .............................................................................................................. 202
2.4.21 Other symptoms............................................................................................................................................. 204
3 Components
3.1 4-way valve...................................................................................................................................................................... 206
3.1.1 Checking procedures ...................................................................................................................................... 206
3.1.2 Repair procedures .......................................................................................................................................... 211
3.2 Branch selector box PCB ................................................................................................................................................. 214
3.2.1 Checking procedures ...................................................................................................................................... 214
3.2.2 Repair procedures .......................................................................................................................................... 217
3.3 Compressor ..................................................................................................................................................................... 221
3.3.1 Checking procedures ...................................................................................................................................... 221
3.3.2 Repair procedures .......................................................................................................................................... 227
3.4 Crankcase heater ............................................................................................................................................................ 234
3.4.1 Checking procedures ...................................................................................................................................... 234
3.4.2 Repair procedures .......................................................................................................................................... 236
3.5 Current sensor ................................................................................................................................................................ 237
3.5.1 Checking procedures ...................................................................................................................................... 237
3.5.2 Repair procedures .......................................................................................................................................... 238
3.6 E-bridge ........................................................................................................................................................................... 240
3.6.1 Checking procedures ...................................................................................................................................... 240
3.6.2 Repair procedures .......................................................................................................................................... 242
3.7 Expansion valve............................................................................................................................................................... 244
3.7.1 Outdoor unit expansion valve ........................................................................................................................ 244
3.7.2 Branch selector box expansion valve ............................................................................................................. 252
3.8 Fan inverter PCB.............................................................................................................................................................. 259
3.8.1 Single fan outdoor unit................................................................................................................................... 259
3.8.2 Double fan outdoor unit................................................................................................................................. 265
3.9 High pressure switch....................................................................................................................................................... 270
3.9.1 Checking procedures ...................................................................................................................................... 270
3.9.2 Repair procedures .......................................................................................................................................... 272
3.10 Inverter PCB .................................................................................................................................................................... 274
Table of contents
206
Service manual
7