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Troubleshooting SiBE04-624_B
100 Service Diagnosis
2.17 Signal Transmission Error (between Indoor Unit and
Outdoor Unit)
Error Code
U4
Method of Error
Detection
The data sent from the outdoor unit is checked for problem.
Error Decision
Conditions
The data sent from the outdoor unit cannot be received without error, or the disable status of
signal transmission continues for 15 seconds.
Supposed
Causes
Wiring error
Breakage of relay wire (transmission wire)
Defective outdoor unit PCB
Defective fan motor
Defective indoor unit PCB
Troubleshooting
NO
Does the distance of
relay wire exceed
30 m?
(R18125)
YES
YES
Caution
Check the relay wire between the
indoor unit and the outdoor unit
for color and number.
Any improper wiring?
YES
Poor insulation
OK
Are the relay
wires and the earth
properly insulated?
Is the measured
value 30 to 50 V?
YES
NO
NO
Does LED A on the
outdoor unit blink?
Disconnect No. 3.
Measure the voltage between
No. 2 and 3 (Apply negative
terminal to No. 2 in DC range)
NO
(below 30 V or above 50 V)
Correct the relay wire
between the indoor unit and
the outdoor unit.
Replace the relay wire
between the indoor and the
outdoor unit.
Distance is to be within the
specified range (30 m or
less).
Replace the outdoor unit
PCB.
Replace the indoor unit
PCB (Control PCB).
Replace the outdoor unit
PCB.
YES
NO
Replace both the fan motor
and the outdoor unit PCB.
Rotate the
outdoor fan by hand.
Does the outdoor fan rotate
smoothly?
7 sec.
Voltage
Power on
15 sec. Stop
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
Check during
this period
Fault
determined
- Inverter Pair 1
- Wall Mounted Type 2
- E-Series 2
- SiBE04-624_B 3
- Table of Contents ii 3
- Table of Contents iv 5
- 1. Introduction 6
- 1.2 Used Icons 10
- List of Functions 11
- 1. Functions 12
- SiBE04-624_B Functions 13
- List of Functions 3 13
- : Holding Functions 13
- — : No Functions 13
- Specifications 14
- 1. Specifications 15
- 50 Hz, 220 - 230 - 240 V 16
- Connector Wiring Diagram 19
- Printed Circuit Board 19
- 1. Indoor Unit 20
- SiBE04-624_B Indoor Unit 21
- Indoor Unit SiBE04-624_B 22
- 2. Outdoor Unit 23
- Function and Control 24
- Target temperature 25
- Set temperature 25
- Room temperature 25
- Room thermistor temperature 25
- (R12321) 25
- 1.3 Airflow Direction Control 27
- COMFORT 28
- AIRFLOW 28
- Operation 28
- SiBE04-624_B Main Functions 29
- Function and Control 19 29
- (R11681) 30
- (R13860) 30
- 1.5 Thermostat Control 31
- Main Functions SiBE04-624_B 32
- 22 Function and Control 32
- 24 Function and Control 34
- (R18142) 35
- (R13863) 36
- (R13864) 36
- (R13865) 36
- Function and Control 27 37
- 28 Function and Control 38
- Function and Control 29 39
- 30 Function and Control 40
- 1.8 AUTO Operation 42
- 1.9 MOISTURIZING Operation 43
- Air purification flow 44
- (R13882) 45
- (R13883) 45
- Fresh Air 46
- HOME LEAVE VENTILATION 47
- 1.13 TIMER Operation 48
- 1.14 NIGHT SET Mode 49
- 1.15 COMFORT SLEEP Operation 50
- Human sleep 51
- Reference 51
- POWERFUL operation 52
- (Cannot be used while 52
- 1.17 MOLD PROOF Operation 53
- 44 Function and Control 54
- 1.18 MOLD SHOCK OUT Operation 55
- 46 Function and Control 56
- 1.19 INFORMATION DISPLAY 58
- Multi-colored indicator lamp 59
- 1.23 Clock Setting 60
- (R18148) 61
- [ON/OFF] button 61
- 1.26 Table for Special Modes 62
- Function and Control 53 63
- 2. Control Specification 64
- 2.2.1 Preheating Operation 66
- 2.2.4 3-minute Standby 67
- Correction value (c) = 0 deg 68
- Correction value (c) = 7 deg 68
- Outdoor temperature 68
- 2.4 Input Current Control 69
- 2.6 Heating Peak-cut Control 70
- 2.8 Dew Prevention Control 71
- 2.9 Outdoor Fan Control 72
- 2.11 Defrost Control 73
- Function and Control 65 75
- Maximum opening (pulse) 470 75
- Minimum opening (pulse) 52 75
- 66 Function and Control 76
- Remote Controller 77
- (R18216) 78
- (R18217) 79
- — : Not available 80
- Service Diagnosis 81
- 72 Service Diagnosis 82
- 1.1 Indoor Unit 83
- 1.2 Outdoor Unit 83
- 2. Troubleshooting 84
- Service Diagnosis 75 85
- Service Diagnosis 77 87
- 78 Service Diagnosis 88
- Service Diagnosis 79 89
- 80 Service Diagnosis 90
- Check No.20 91
- Refer to P.142 91
- 82 Service Diagnosis 92
- Service Diagnosis 83 93
- Service Diagnosis 85 95
- (R18325) 96
- Service Diagnosis 87 97
- Service Diagnosis 89 99
- Troubleshooting 100
- Check No.02 100
- Refer to P.135 100
- SiBE04-624_B Troubleshooting 101
- Service Diagnosis 91 101
- Service Diagnosis 93 103
- 94 Service Diagnosis 104
- Troubleshooting SiBE04-624_B 104
- Service Diagnosis 95 105
- 2.15 Refrigerant Shortage 106
- Check No.01 107
- Refer to P.134 107
- Check No.12 107
- Refer to P.136 107
- 98 Service Diagnosis 108
- Outdoor Unit) 110
- Circuit Abnormality 111
- Check No.11 113
- 104 Service Diagnosis 114
- Service Diagnosis 105 115
- 106 Service Diagnosis 116
- Service Diagnosis 107 117
- 108 Service Diagnosis 118
- Service Diagnosis 109 119
- 2.24 Compressor Lock 120
- 2.25 DC Fan Lock 121
- 112 Service Diagnosis 122
- Service Diagnosis 113 123
- 114 Service Diagnosis 124
- Service Diagnosis 115 125
- 116 Service Diagnosis 126
- Service Diagnosis 117 127
- 2.31 Damper Abnormality 128
- Service Diagnosis 119 129
- 120 Service Diagnosis 130
- Service Diagnosis 121 131
- H9, J3, J6, P4 132
- Service Diagnosis 123 133
- 124 Service Diagnosis 134
- A (°C) B (°C) C (°C) 134
- 122 113 120 134
- (R18079) 135
- 126 Service Diagnosis 136
- A (°C) B (°C) 136
- (R18323) 137
- 128 Service Diagnosis 138
- Service Diagnosis 129 139
- 130 Service Diagnosis 140
- 2.39 Heater Wire Abnormality 141
- 132 Service Diagnosis 142
- P9" troubleshooting 143
- 3. Check 144
- 3.3 Humidity Sensor Check 145
- Check SiBE04-624_B 146
- 136 Service Diagnosis 146
- Check No.13 147
- 3.8 Inverter Analyzer Check 148
- (R15292) 149
- (R13941) 150
- 3.11 Discharge Pressure Check 151
- 3.12 Outdoor Fan System Check 152
- 3.13 Main Circuit Short Check 152
- (R18324) 153
- Power module 153
- Check No.23 154
- Trial Operation and 155
- Field Settings 155
- (R14035) 156
- [ON/OFF] button (SW1) 157
- (R18139) 157
- (R14118) (R14035) 158
- (R14036) 159
- [CLOCK] button 159
- [SELECT] button 159
- Electrical box 160
- (R14037) 160
- (R18328) 160
- (R18015) 161
- (R18016) 161
- (R18017) 161
- Appendix 162
- 1. Piping Diagrams 163
- 3D052768D 164
- 3D055425C 164
- Appendix 155 165
- Revision History 166
- All rights reserved 167
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