Hitachi UTOPIA RAS-4HVRP2E Service Manual page 10

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9. Servicing ................................................................................................................. 175
9.1 Safety Introduction .............................................................................................................................. 176
9.2 RAS-3HVRC2...................................................................................................................................... 177
9.2.1 Removing the pipe cover ............................................................................................................................. 177
9.2.2 Removing the front cover ............................................................................................................................ 177
9.2.3 Removing the outdoor fan ........................................................................................................................... 178
9.2.4 Removing the compressor .......................................................................................................................... 179
9.2.5 Removing the high pressure switch and pressure switch for control .......................................................... 181
9.2.6 Removing the 4-way valve coil .................................................................................................................... 181
9.2.7 Removing the electronic expansion valve coil ............................................................................................. 182
9.2.8 Removing the electrical box ........................................................................................................................ 182
9.2.9 Removing Display PCB ............................................................................................................................... 183
9.2.10 Removing other electrical components ..................................................................................................... 183
9.3 RAS-(4-6)H(V)(R/N)(C/P)2E ............................................................................................................... 184
9.3.1 Removing service cover .............................................................................................................................. 184
9.3.2 Remove outlet grille ..................................................................................................................................... 184
9.3.3 Removing upper cover ................................................................................................................................ 184
9.3.4 Removing bottom service cover and rear cover .......................................................................................... 185
9.3.5 Removing outdoor fan motor ....................................................................................................................... 185
9.3.6 Removing electrical box .............................................................................................................................. 186
9.3.7 Removing the compressor .......................................................................................................................... 189
9.3.8 Removing the High pressure switch and Pressure switch for control ......................................................... 193
9.3.9 Removing 4-way valve coil .......................................................................................................................... 195
9.3.10 Removing electronic expansion valve coil ................................................................................................. 195
9.3.11 Removing solenoid valve coil (SVA) .......................................................................................................... 196
9.3.12 Removing 4-way valve .............................................................................................................................. 196
9.3.13 Removing Electronic expansion valve ....................................................................................................... 197
9.3.14 Removing Solenoid valve .......................................................................................................................... 198
9.3.15 Disassembly / Assembly the Electrical components for RAS-(4-6)HV(R/N)(C/P)2E ................................. 199
9.3.16 Disassembly / Assembly Electrical components for RAS-(4-6)H(R/N)(C/P)2E ......................................... 204
9.3.17 Removing pipe thermistors ........................................................................................................................ 209
10. Troubleshooting ..................................................................................................... 211
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
viii SMGB0136 rev.0 - 07/2021