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SiBE12-519
Troubleshooting
Service Diagnosis
169
4.23
Outdoor Unit PCB Abnormality or Signal Transmission
Circuit Abnormality
Remote
Controller
Display
U4
Method of
Malfunction
Detection
The data received from the outdoor unit in indoor unit-outdoor unit signal transmission is
checked whether it is normal.
Malfunction
Decision
Conditions
When the data sent from the outdoor unit cannot be received normally, or when the content of
the data is abnormal.
If the indoor unit cannot communicate with the outdoor unit for 15 seconds, the system will be
shut down.
Supposed
Causes
Faulty outdoor unit PCB.
Faulty indoor unit PCB.
Indoor unit-outdoor unit signal transmission error due to wiring error.
Indoor unit-outdoor unit signal transmission error due to breaking of wire in the connection
wires between the indoor and outdoor units (the transmission wire).
Troubleshooting
Check the outdoor unit's LED A.
Check the indoor unit-outdoor unit
connection wires.
YES
YES
Correct the indoor unit-outdoor
unit connection wires.
Replace the connection wirings.
Carry out the wiring work
within the regulation.
(less than 30m)
Replace the outdoor unit PCB.
Replace the indoor unit PCB.
Replace the outdoor unit PCB.
Is there any wiring error?
NO
(R3046)
Is LED A flashing?
Is the voltage 30~50V?
NO
Check the voltage of the indoor
unit-outdoor unit connection wires
between No.2 and No. 3. (Touch
the No.2 termintal with (-) in DC
range)
YES
NO
Fine
NO
Disconnect the No.3 terminal.
Not enough
Fully insulated?
ex. between wirings, earth.
YES
The connection wiring
length over 30m?
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Summary of Contents for 2MKS40DVMB
Page 10: ...SiBE12 519 List of Functions 1 Part 1 List of Functions 1 Cooling Only 2 2 Heat Pump 4 ...
Page 15: ...Heat Pump SiBE12 519 6 List of Functions ...
Page 29: ...Heat Pump SiBE12 519 20 Specifications ...
Page 135: ...Instruction SiBE12 519 126 System Configuration ...
Page 211: ...Outdoor Unit SiBE12 519 202 Removal Procedure ...