Hitachi UTOPIA RAS-4HVRP2E Service Manual page 11

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10.1.2.4 Abnormal transmission between remote control switch and indoor unit ...................................... 222
10.1.2.5 Abnormal operation of the devices ............................................................................................... 223
10.2 Troubleshooting procedure ................................................................................................................. 234
10.2.1 RAS-3HVRC2 ............................................................................................................................................ 234
10.2.1.1 Alarm codes for the outdoor units ................................................................................................ 234
10.2.1.2 Troubleshooting by alarm code .................................................................................................... 236
10.2.2 RAS-(4-6)H(V)(R/N)(C/P)2E ..................................................................................................................... 260
10.2.2.1 Alarm codes of wired controller .................................................................................................... 260
10.2.2.2 Troubleshooting by alarm code .................................................................................................... 263
10.3 Troubleshooting in check mode .......................................................................................................... 296
10.3.1 RAS-3HVRC2 ............................................................................................................................................ 296
10.3.1.1 Check mode display by Unit controller ......................................................................................... 296
10.3.1.2 Troubleshooting using the 7 segment display (Outdoor unit) ....................................................... 296
10.3.2 RAS-(4-6)H(V)(R/N)(C/P)2E ..................................................................................................................... 301
10.3.2.1 Troubleshooting by using the 7-segment display ......................................................................... 301
10.4 Checking procedure for main parts ..................................................................................................... 308
10.4.1 RAS-3HVRC2 ............................................................................................................................................ 308
10.4.1.1 Checking procedure for the PCB ................................................................................................. 308
10.4.1.2 Checking procedeure for the DC fan motor ................................................................................. 309
10.4.1.3 Checking procedure for the electronic expansion valve for indoor and outdoor units.................. 310
10.4.1.4 Checking procedure for other parts ...............................................................................................311
10.4.1.5 Checking procedure for the inverter PCB .................................................................................... 313
10.4.1.6 Checking procedure for the compressor ...................................................................................... 314
10.4.2 RSW, DSWs and LEDs functions RAS-(4-6)HV(R/N)(C/P)2E .................................................................. 316
10.4.2.1 Location of print circuit boards (PCBs) ......................................................................................... 316
10.4.2.2 Purpose ........................................................................................................................................ 316
10.4.3 RSW, DSWs and LEDs functions RAS-(4-6)H(R/N)(C/P)2E ..................................................................... 319
10.4.3.1 Location of print circuit boards (PCBs) ......................................................................................... 319
10.4.3.2 Purpose ........................................................................................................................................ 319
11. Maintenance notes ................................................................................................. 323
11.1 General notes ...................................................................................................................................... 324
11.1.1 Checking the power source and the wiring connection ............................................................................. 324
11.1.3 Insufficient cooling performance when a long piping is applied ................................................................. 324
11.1.4 Abnormally high operation sound (in the ceiling type indoor unit) ............................................................. 325
11.1.5 Alarm code "31" ......................................................................................................................................... 325
11.1.6 Not cooling well due to insufficient installation space for the outdoor unit ................................................. 325
11.2 Maintenance work ............................................................................................................................... 326
11.3 Service and maintenance record......................................................................................................... 327
ix SMGB0136 rev.0 - 07/2021