Daikin FVKS25BAVMB - User Manual

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Inverter Pair

Floor Standing Type B-Series

[Applied Models]

zInverter Pair : Cooling Only

zInverter Pair : Heat Pump

SiBE06 - 514A

Main Page

Table of Contents3
Introduction6
- Safety Cautions6
Part 1 List of Functions10
List of Functions11
Part 2 Specifications14
Specifications15
- Cooling Only15
- Heat Pump17
Part 3 Printed Circuit Board Connector Wiring Diagram20
Printed Circuit Board Connector Wiring Diagram21
- Indoor Unit21
- Outdoor Unit23
Part 4 Function and Control26
Main Functions27
- Frequency Principle27
- Flap Control29
- Air Flow Selection30
- Fan Speed Control for Indoor Units31
- Programme Dry Function32
- Automatic Operation33
- Thermostat Control34
- NIGHT SET Mode35
- HOME LEAVE Operation36
- Inverter POWERFUL Operation37
- Other Functions38
Function of Thermistor40
- Heat Pump Model40
- Cooling Only Model41
Control Specification42
- Mode Hierarchy42
- Frequency Control43
- Controls at Mode Changing / Start-Up45
- Discharge Pipe Control46
- Input Current Control47
- Freeze-Up Protection Control48
- Heating Peak-Cut Control48
- Fan Control49
- Liquid Compression Protection Function 249
- Defrost Control50
- Electronic Expansion Valve Control51
- Malfunctions54
- Forced Operation Mode55
- Additional Function55
- Facility Setting Jumper (Cooling at Low Outdoor Temperature)56
Part 5 System Configuration58
System Configuration59
Instruction60
- Safety Precautions60
  - Installation Site61
  - Electrical Work61
- Names of Parts62
- Remote Controller64
- Preparation before Operation65
- AUTO · DRY · COOL · HEAT · FAN Operation68
- Adjusting the Air Flow Direction70
- POWERFUL Operation72
- OUTDOOR UNIT SILENT Operation73
- HOME LEAVE Operation74
- TIMER Operation76
- Care and Cleaning78
  - Air Filter79
  - Before a Long Idle Period80
- Troubleshooting81
Part 6 Service Diagnosis86
Caution for Diagnosis87
Problem Symptoms and Measures88
Service Check Function89
Troubleshooting92
- Error Codes and Description92
- Indoor Unit PCB Abnormality93
- Freeze-Up Protection Control or High Pressure Control94
- Fan Motor (DC Motor) or Related Abnormality96
- Thermistor or Related Abnormality (Indoor Unit)98
- Shutter Drive Motor / Shutter Limit Switch Abnormality99
- Signal Transmission Error (between Indoor and Outdoor Unit)100
- Unspecified Voltage (between Indoor and Outdoor Units)101
- Outdoor Unit PCB Abnormality102
- OL Activation (Compressor Overload)103
- Compressor Lock104
- DC Fan Lock105
- Input over Current Detection106
- Four Way Valve Abnormality107
- Discharge Pipe Temperature Control109
- High Pressure Control in Cooling110
- Compressor System Sensor Abnormality112
- Position Sensor Abnormality113
- DC Voltage / Current Sensor Abnormality114
- Thermistor or Related Abnormality (Outdoor Unit)115
- Electrical Box Temperature Rise117
- Radiation Fin Temperature Rise119
- Output over Current Detection121
- Insufficient Gas123
- Over-Voltage Detection125
Check126
- How to Check126
Part 7 Removal Procedure134
Indoor Unit135
- Removal of the Air Filter / Front Panel135
- Removal of the Horizontal Blade138
- Removal of the Electrical Box139
- Removal of the PCB142
- Removal of the Heat Exchanger144
- Removal of the Fan Rotor / Fan Motor146
Outdoor Unit148
- Removal of Panels and Fan Motor148
- Removal of Electrical Box155
- Removal of Reactor and Partition Plate157
- Removal of Sound Blanket159
- Removal of Four Way Valve161
- Removal of Compressor163
- Removal of PCB165
Part 8 Others168
Others169
- Test Run from the Remote Controller169
- Jumper Settings170
Part 9 Appendix172
Piping Diagrams173
- Indoor Units173
- Outdoor Units174
Wiring Diagrams176
- Indoor Units176
- Outdoor Units176
Index178
Drawings & Flow Charts182

Questions and Answers

N
Nicole BuckleyAug 11, 2025
What to do if my Daikin Air Conditioner operation stops suddenly and the OPERATION lamp flashes?
- L
  Lindsay FergusonAug 11, 2025
  If the OPERATION lamp on your Daikin Air Conditioner is flashing and the operation stops suddenly, clean the air filters or remove any obstructions. Then, turn the breaker OFF and then ON again. Try operating the air conditioner with the remote controller. If the lamp continues to flash, no answer.
S
Samantha HowardAug 27, 2025
What to do if an abnormal functioning happens during operation of Daikin Air Conditioner?
- T
  Thomas ArmstrongAug 27, 2025
  If your Daikin Air Conditioner is experiencing abnormal functioning during operation, turn the breaker OFF, then turn it ON again. Try operating the air conditioner with the remote controller.