Service Manual 257
Self-diagnosis function
3. Self-diagnosis function
Self-Diagnosis Function
Error Indicator
• This function indicates types of failure in self-diagnosis and occurrence of failure for air condition.
• Error mark is displayed on display window of Indoor Units and wired remote controller, and 7-segment LED of
Outdoor Unit control board as shown in the table.
• If more than two troubles occur simultaneously, lower number of error code is first displayed.
• After error occurrence, if error is released, error LED is also released simultaneously.
Display Title Cause of Error
0
0
0
0
0
0
0
0
0
1
2
3
4
5
6
7
8
9
2
2
2
2
2
1
2
3
4
5
3
3
3
3
3
1
2
3
4
5
Indoor Unit air sensor
Indoor Unit sensor(inlet pipe)
Wired remote control ↔ Indoor
Unit transmission
Drain pump
Outdoor unit ↔ Indoor Unit trans-
mission
Indoor Unit outlet pipe sensor
The other operation mode
Not in use
Serial No. Error
DC peak
Excess of limited current of Main
Outdoor Unit INV compressor
Poor voltage charge for driving
INV compressor
High Pressure Switch of Main
Outdoor Unit
Low/Over voltage
Not in use
Discharge temperature of Main
Outdoor Unit (INV compressor)
Discharge temperature of Main
Outdoor Unit (constant speed
compressor)
High pressure of Main Outdoor
Unit
Low pressure of Main Outdoor
Unit
Indoor Unit air sensor open or short
Indoor Unit inlet pipe sensor open or short
In the case that Indoor Unit can not receive any signal
from wired remote control successively for 3 minutes
Malfunction of drain pump
In the case that Indoor Unit can not receive any signal
from Outdoor Unit successively for 3 minutes
Indoor Unit outlet pipe sensor open or short
In the case that an Indoor Unit is operated the other
operation mode different from the operated Indoor Unit
Not in use
In the case that the serial number marked on
EEPROM of Indoor Unit is 0 or FFFFFF
IPM over temperature or compressor malfunction
When current detection is over the maximum current
limit
DC charging is not performed after starting relay turn
on
Suspension of compressor by the Main Outdoor Unit High
Pressure switch
Input voltage is out of tolerance of rating voltage
Not in use
Due to over rising of INV compressor discharge tempera-
ture, Compressor off is occurred 3 times in 1
hour
Due to over rising of constant speed compressor dis-
charge temperature, Compressor off is occurred
3times in an hour
Compressor Off by excessive increase of Main
Outdoor Unit High Pressure
Compressor Off by excessive reduction of Main
Outdoor Unit Low Pressure
Indoor Unit related error
Power related error
Compressor related error
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