Service Manual
Table Of Contents
- 1. General Information
- 2. Specification
- 3. Dimension
- 4. Piping Diagram
- 5. Wiring Diagram
- 6. Capacity Calculation Due to Capacity Modification Coefficient
- 7. Cooling Capacity
- 8. Heating capacity
- 9. Operation Range
- 10. Sound Level
- 11. Outdoor Piping Installation
- 12. Outdoor Wiring Installation
- 13. Outdoor Unit PCB
- 14. Dip Switch Setting
- 15. Monitor Tools
- 16. Outdoor Unit Control
- 17. Failure Code
- 18. Troubleshooting
77
[75-0, 75-4] Pressure difference between high pressure and low pressure is abnormal
Check if high/ low pressure
sensor is connected well
Check if compressor wire is
connected normally
If wire of inverter compressor
are connected oppositely
If 4-way valve is
interconnected
Measure if there is voltage
U, V, W of compressor by
multimeter, and if it is normal
Replace inverter compressor
Re-connect
Correct compressor wire
Correct compressor wire
Replace 4-way valve
Replace inverter module
No
No
No
No
No
No
Yes
Yes
Yes
Yes