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Outdoor Unit
12
TROUBLESHOOTING
You can perform fault diagnosis of the outdoor unit with the LEDs on the P.C. board of the outdoor unit in addition
to using the check codes displayed on the wired remote controller of the indoor unit.
Use the LEDs and error codes for various checks. Details of the error codes displayed on the wired remote
controller of the indoor unit are described in the Installation Manual of the indoor unit.
Verifying Error code status (Outdoor control
board)
1. Check that DIP switch SW803 is set to off.
2. Record the states (on or off) of LED 800 to LED 804
(Display mode 1).
3. Press SW800 for at least 1 second. The LED status
changes to display mode 2.
4. Since display mode 1 covers multiple errors with the
same code display, mode 2 must also be used to
determine the final error. Use the status recorded for
LED 800 to LED 804 in display mode 1 (Item 2
above) and combine it with the status for the same
LED's in display mode 2 (Item 3 above) to determine
the complete error code using the chart below.
No.
Cause
1
Normal
2
Discharge (TD) sensor error
3
Heat exchanger (TE) sensor error
4
Heat exchanger (TL) sensor error
5
Outside air temperature (TO) sensor error
6
Suction (TS) sensor error
7
Heat sink (TH) sensor error
Outdoor temperature sensor (TE/TS) connection
8
error
9
Outdoor EEPROM error
10
Compressor lock
11
Compressor lock
12
Current detection circuit error
13
Thermostat for compressor activated
Model data not set
14
(on the service P.C. board)
15
MCU-MCU communication error
16
Discharge temperature error
Abnormal power
17
(open phase detected or abnormal voltage)
18
Heat sink overheat
19
Gas leak detected
20
4-way valve reverse error
21
High pressure release operation
Verifying Error code status stored in
memory (Outdoor control board)
1. Check that DIP switch SW803 is set to on.
2. Record the states (on or off) of LED 800 to LED 804
(Display mode 1).
3. Press SW800 for at least 1 second. The LED status
changes to display mode 2.
4. Since display mode 1 covers multiple errors with the
same code display, mode 2 must also be used to
determine the final error. Use the status recorded for
LED 800 to LED 804 in display mode 1 (Item 2
above) and combine it with the status for the same
LED's in display mode 2 (Item 3 above) to determine
the complete error code using the chart below.
NOTE
An outside air temperature (TO) sensor error can be
checked only when an error occurs.
Display mode 1
D800
D801
D802
D803
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– 20 –
Installation Manual
Display mode 2
D804
D800
D801
D802
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D803
D804
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20-EN
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