4-4-3 Water pump & flow switch OFF ...........................................................................................................................71

4-4-4 Water pump & flow switch ON ............................................................................................................................72

4-4-5 Hydro unit temperature sensor(open/short) ................................................................................................73

4-4-6 Communication error after finishing Tracking(Hydro unit)....................................................................74

4-5 Items to check before diagnostics ...............................................................................................................................75

4-5-1 Test run mode and view mode ............................................................................................................................75

4-5-2 Troubleshooting for outdoor unit ......................................................................................................................76

4-5-3 Troubleshooting for outdoor unit(cont.) .........................................................................................................77

4-6 Troubleshooting by symptoms .....................................................................................................................................78

4-6-1 Communication error after finishing tracking (E202) ...............................................................................78

4-6-2 Time out (1min.) of communication error between MAIN PBA and INV. PBA (E203) .................79

4-6-3 Temperature sensor error (E221, E231, E251, E320) ...................................................................................80

4-6-4 Fan error (E458, E475) ..............................................................................................................................................81

4-6-5 Compressor error (E461, E467) ............................................................................................................................83

4-6-6 Current trip error (E462, E463) .............................................................................................................................84

4-6-7 IPM(IGBT module) over current error (E464) .................................................................................................85

4-6-8 DC-link voltage under/over error (E466) .........................................................................................................87

4-6-9 GAS leak error (E554) ................................................................................................................................................88

4-6-10 The other errors ........................................................................................................................................................89

4-6-11 In case of heating at the cooling mode or cooling at the heating mode .....................................90

4-6-12 Outdoor unit is not powered on - Initial diagnosis ..................................................................................92

4-6-13 Outdoor unit power supply error ....................................................................................................................93

5. PCB Diagram ........................................................................................................... 94

5-1 Hydro unit ................................................................................................................................................................................94

5-2 Tank Integrated Hydro Unit / Hydro Unit

5-3 Outdoor Unit...........................................................................................................................................................................98

6. Wiring Diagram ..................................................................................................... 108

6-1 Hydro unit ............................................................................................................................................................................. 108

6-1-1 1Phase Model ........................................................................................................................................................... 108

6-1-2 3Phase Model ............................................................................................................................................................ 109

6-2 Outdoor Unit........................................................................................................................................................................ 110

6-3 Tank Integrated Hydro Unit ........................................................................................................................................... 113

7. Piping Diagram ..................................................................................................... 114

7-1 Piping Diagram .................................................................................................................................................................. 114

8. Reference Sheet .................................................................................................... 120

8-1 Index for Model Name..................................................................................................................................................... 120

8-1-1 Outdoor Unit / Hydro Unit .................................................................................................................................. 120

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Table of Contents