Hitachi YUTAMPO Series Service Manual page 7

General Index
4.2.1 Safety thermostat (water temperature safety device) .................................................................................... 48
4.2.2 Electrical heater ............................................................................................................................................ 49
4.2.3 DHW Thermistor ............................................................................................................................................ 49
5. Servicing ................................................................................................................... 51
5.1 Outdoor unit........................................................................................................................................... 52
5.1.1 Procedure for disassembly and reassembly the outdoor unit ....................................................................... 52
5.2 Indoor unit ............................................................................................................................................. 53
5.2.1 Removing the service cover .......................................................................................................................... 53
5.2.2 Replacement of the LCD Controller .............................................................................................................. 53
5.2.3 Replacement the PCB ................................................................................................................................... 54
5.2.4 Replacement of the electrical heater ............................................................................................................. 54
5.2.5 Replacement of the thermistor ...................................................................................................................... 55
5.2.6 Replacement of the safety thermostat ........................................................................................................... 55
5.2.7 Replacing the Mg Anode rod ......................................................................................................................... 56
6. Troubleshooting ....................................................................................................... 57
6.1 Outdoor unit........................................................................................................................................... 58
6.1.1 Discharge procedure and power shut off method for power circuit ............................................................... 58
6.1.2 Troubleshooting support ................................................................................................................................ 60
6.1.3 Self-diagnosis lighting mode ......................................................................................................................... 61
6.1.4 Checking the electrical parts of the outdoor unit ........................................................................................... 64
6.1.5 Checking the refrigerant cycle ....................................................................................................................... 67
6.1.6 How to run the indoor unit with the outdoor unit test switch .......................................................................... 68
6.1.7 Service Call Q&A ........................................................................................................................................... 69
6.2 Indoor unit ............................................................................................................................................ 70
6.2.1 Operation ....................................................................................................................................................... 71
6.2.2 Troubleshooting by alarm code (related to tank) ........................................................................................... 72
6.3 Troubleshooting by protection code (Outdoor unit) ............................................................................... 74
7. Maintenance notes ................................................................................................... 81
7.1 Maintenance work ................................................................................................................................. 82
7.1.1 Outdoor unit ................................................................................................................................................... 82
7.1.2 Indoor unit ..................................................................................................................................................... 83
V SMGB0135 rev.0 - 03/2020