Initial Setting Error
Outdoor unit main PCB
Check Point 3 : Chech the outdoor unit address/ number of connected slave units setting.
Setting check of outdoor unit address of each outdoor unit
Check the number setting of slave unit
OK
Drop the power and perform the check.
Change Main PCB and set up the original address.
Master unit: When the power is turned on, the number of connected slave units set at
the master unit and the number of slave units received by communication do not match.
When no communication data can be received from the Inverter PCB at the time of power ON.
(In this case, "Inverters communication error" also occurs.)
When no communication data can be received from the Transmission PCB at the time of power ON.
(In this case, "Outdoor unit transmission PCB parallel communication error" also occurs.)
Slave unit: When the power is turned on, not even one master unit communication data
can be received.
1. Power supply defective
2. Outdoor unit address/number of connected slave units setting mistake
3. The number setting mistake of outdoor unit
4. Connection of communication line between outdoor units defective
5. Noise 6.Main PCB defective 7. Inverter PCB defective 8. Transmission PCB defective
Indoor Unit : No Display
Outdoor Unit : - - - -
Error Code : No Display
Trouble shooting 71
Indicate or Display:
Detective Actuators:
Detective details:
OUTDOOR UNIT Error Method:
Forecast of Cause :
YES
NO
YES
Check if ground is connection correctly or
there are no related cables near the power line.
Check Point 1-1 : Turn the power on again
Error displayed again?
Check Point 1-2 : Noise
NO
Check Point 2 : Check error display
"Inverters communication error" or
"Outdoor unit transmission PCB parallel communication error" also occur?
In case of "Inverters communication error",
Refer to the Trouble shooting No. 32.
In case of "Outdoor unit transmission PCB parallel communication error",
Refer to the Trouble shooting No.35.
Check Point 4 : Check the number setting of outdoor units
Check the number setting of outdoor units
OK
Check Point 5 : Check the connection of communication line between outdoor units
Connection and open check of communication lines between outdoor units
OK
Check Point 6 : Replace Main PCB
* Service tool does not indicate the Error code
04-80
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