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SiEN18-622
Troubleshooting for BP Unit
Troubleshooting
357
6.5
Transmission Error between Outdoor Unit and BP Unit
Outdoor Unit
Indication
UJ
Method of
Malfunction
Detection
Transmission error is detected when the outdoor unit could not received the data from BP unit
correctly.
Malfunction
Decision
Conditions
When the data from BP unit could not be correctly received continuously for 10 minutes
Supposed
Causes
Incorrect connection of transmission wire
Faulty outdoor unit power supply
Faulty BP unit PCB
Faulty outdoor unit PCB
Distortion of power supply wave
Troubleshooting
Check No.14
Refer to P.358
Turn the power supply off.
YES
Is it normal?
NO
Check the transmission wire
between outdoor unit - BP
unit
Is HAP
on the outdoor unit PCB
blinking?
NO
Turn the power supply back
on.
YES
NO
(Q0394)
YES
Check No. 14
Check the power supply
waveform.
Is UJ displayed?
NO
Is it deformed?
YES
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Check the transmission
wire and the connection
orders.
Replace outdoor unit
control PCB.
Could be outside causes
other than errors.
Probe where the noise
comes from, and apply
remedy required.
Probe the causes for
deformation of power supply
waveform and apply remedy
required.
Replace outdoor unit
control PCB.
Summary of Contents for FTKS50BVMB
Page 1: ...SiEN18 622 E Series Service Manual Applied Models zSuper Multi Plus Cooling Only Heat Pump ...
Page 105: ...Refrigerant Flow for Each Operation Mode SiEN18 622 92 Refrigerant Circuit ...
Page 157: ...Indoor Unit SkyAir Models SiEN18 622 144 Function ...
Page 312: ...SiEN18 622 Ceiling Mounted Cassette Type System Configuration 300 ...
Page 424: ...Method of Replacing The Inverter s Power Transistors Modules SiEN18 622 412 Troubleshooting ...
Page 446: ...Wiring Diagrams SiEN18 622 434 Appendix ...
Page 452: ...SiEN18 622 vi Index ...