Hitachi UTOPIA RAS-4HVRP2E - Troubleshooting

10 Troubleshooting
SMGB0136 rev.0 - 07/2021
211
10
Index
10.1 Initial troubleshooting ..........................................................................................................................213
10.1.1 RAS-3HVRC2 ............................................................................................................................................ 213
10.1.1.1 Simple checking procedure by means of the 7-segment display ................................................. 213
10.1.1.2 Power supply failure to the indoor unit and the remote control switch (PC-ARFP1E) ................. 213
10.1.1.3 Abnormal operation of the devices ............................................................................................... 214
10.1.2 RAS-(4-6)H(V)(R/N)(C/P)2E ..................................................................................................................... 217
10.1.2.1 Checking the electrical wires and the power source ................................................................... 217
10.1.2.2 Checking by 7-segment display ................................................................................................... 218
10.1.2.3 Failure of the power supply to indoor units and the remote control switch .................................. 221
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. Troubleshooting