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SiEN12-710A
Troubleshooting
Service Diagnosis
143
4.24 Outdoor Unit PCB Abnormality or Signal Transmission
Circuit Abnormality
Remote Control
Display
U4
Method of
Malfunction
Detection
1. Detect within the programme of the microcomputer that the programme is operating
normally.
2. When indoor-outdoor unit signal transmission can not be performed for more than 15 sec.
3. Detection of the presence or absence of zero-cross signal.
Malfunction
Decision
Conditions
1. When the programme of the microcomputer is in bad running order.
2. When indoor-outdoor unit signal transmission can not be performed for more than 15 sec.
3. When zero-cross signal can not be detected for more than 10 sec.
Supposed
Causes
"
Display disabled due to power supply fault
"
Communication circuit fault in outdoor unit PCB
"
Out of control of microcomputer caused by external factors
!
Noise
!
Momentary voltage drop
!
Momentary power loss
"
Defective outdoor unit PCB
"
Defective thermal fuse in outdoor terminal board
Summary of Contents for 2MKS40FV1B
Page 11: ...Introduction SiEN12 710A x ...
Page 12: ...SiEN12 710A List of Functions 1 Part 1 List of Functions 1 Cooling Only 2 2 Heat Pump 4 ...
Page 17: ...Heat Pump SiEN12 710A 6 List of Functions ...
Page 25: ...Heat Pump SiEN12 710A 14 Specifications ...
Page 111: ...Instruction SiEN12 710A 100 Operation Manual ...
Page 199: ...Wiring Diagrams SiEN12 710A 188 Appendix ...
Page 203: ...SiEN12 710A iv Index ...