Gree GWC09AA

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GREE Service Manual GWC09AA / K5NNA6A Page 111

Trouble Shooting for PCB

According to the below-provided diagram, identify the possible malfunction related to the controller

and “U8” error code indication

Main Page

Table of Contents3
Table of Content3
Abbreviations Used with this Manual5
Introduction6
General Safety Instructions7
- The Symbols Used in this Manual7
- Electrical Operations9
- Installation Site9
- Minimum Room Size10
Minimum Requirements for Service Personnel Qualifica- Tion11
- Basics in RAC11
Checks for Putting in Operation12
Checks for Leakage12
Handling of Refrigerant12
Installation, Commissioning and Maintenance of a Compressor12
Installation, Commissioning and Maintenance of a Con- Denser13
Installation, Commissioning and Maintenance of an Evapora- Tor13
Piping13
Description of the System and Its Components14
- General Technical Specifications14
- Indoor Unit15
- Outdoor Unit16
- Refrigerant Transfer Pipe-Set17
Capacity Variation Ratio According to Temperature (Diagram)18
Operation Data18
Construction Views > Indoor Unit19
Construction Views > Outdoor Unit20
Refrigerant Flow Diagram21
Schematic Diagram > Electrical Wiring Indoor Unit22
Schematic Diagram > Electrical Wiring Outdoor Unit23
Printed Circuit Board (PCB)24
Relay Box26
Remote Controller > Functional Description27
Functional Specifications for AC System Operation31
- Cooling Mode31
- Dry Mode32
- System Protective Functions33
- Fan and Auto- Mode34
Other Adjustments and Functions of the Remote Controller35
Hydrocarbon Refrigerant R290 Issues38
- Refrigerant Properties / Parameters38
  - Flammability39
  - Hazard Identification39
- First Aid Measures40
  - Fire Fighting Measures41
  - Accidental Release Measures41
The Handling of HC R29042
- Refrigerant Recovery43
Refrigerant Pressure- Temperature Chart48
Flow of Work for AC System Installation, Service, Repair and Dismantling51
AC System Installation52
- Delivery Conditions of Indoor & Outdoor Unit52
- Important Notes52
- Principle Installation Arrangement53
- Tools, Equipment and Accessories54
- Security Advise for Installation55
- Table of Various Installation Height and Resulting Room Size56
  - The Installation Site > General Information56
- Installation Site > Outdoor Unit57
  - Installation Site > Indoor Unit57
- Installation Dimension Diagram58
- Miscellaneous60
  - Installation Procedure > Indoor Unit61
  - Installation of Connection Pipes and Cables62
- Installation of the Outdoor Unit65
  - Interconnection of In- and Outdoor Unit66
- The Quick-Coupler Valves67
Commissioning of the AC System68
- Checks before Commissioning68
- Refrigerant Circuit Commissioning68
- First Operation of the System68
- Indoor Unit68
- Outdoor Unit69
Handing over the System to Your Client69
Start-Up Data Sheet Form70
Service, Repair and Maintenance71
- Directives for Service and Maintenance71
- Regular Annual Preventive Maintenance72
- Maintenance of the Indoor Unit72
- Maintenance of the Outdoor Unit72
- Refrigerant Circuit72
- Maintenance Check-List73
- Safety Work Area & Temporary Flammable Zones74
- Arrangement of Equipment and Tools75
- Refrigerant Venting76
- Venting > Course of Activities > Part 177
- Venting > Part 1 > Detailed Procedure78
- Venting > Course of Activities > Part 279
- Venting > Part 2 > Detailed Procedure80
  - In the Field81
- Flushing the System with OFDN (N 2 )83
- Flushing the System and Provision of "Holding Charge" with84
  - OFDN > Detailed Procedure84
- Provision of a Hermetically Sealed Refrigerant Circuit85
- Leak, Strength and Tightness Testing85
- Leak Check (Bubble Test)87
- Electronic Gas Detectors88
- Leak Testing with OFDN & Weak Soapy Water Solution89
  - Leak Testing with OFDN and "Bubbles" > Detailed Proce- Dure90
- Trace Gas (N 2 /H 2 ) Leak Detection Method91
- Trace Gas Leak Detection > Detailed Procedure93
- Pressure Test (Strength Test) with OFDN94
- Pressure Test (Strength Test) > Detailed Procedure95
- Refrigerant Circuit-Evacuation and Charging96
- Evacuation > Detailed Procedure99
- Charging with Refrigerant100
- Charging with Refrigerant > Detailed Description101
- Start-Up Data Sheet Form for Service and Repair102
- Service Label103
Dismantling, Recycling and Disposal104
Error Codes, LED Flashing and Trouble Shooting105
- Temperature Sensor Trouble Shooting106
- PG Motor (H6) Trouble Shooting107
- Jumper Cap (C5) Trouble Shooting108
- Freeze Protection (E2) Trouble Shooting109
- Low Pressure (E3) Trouble Shooting110
- PCB Board (U8) Trouble Shooting111
- Resistance Table for Temperature Sensors112
Main Spare-Parts List115
Disassembling Procedures116
- Disassembling the Indoor Unit116
- Disassembling the Outdoor Unit121
Exploded Views and Part Lists126
- Exploded View of the Indoor Unit126
- Part List of the Indoor Unit127
- Exploded View of the Outdoor Unit128
- Part List of the Outdoor Unit129
Recommended Equipment and Tools for the Use with HC Refrigerants130

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