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4. Service procedures
1
2
3
4
Section
SM830082
IV - 8
(4) LED Indication on the Outdoor Unit’s P.C.B. Ass’y
If something goes wrong with the outdoor unit, LED lamps on the outdoor P.C.B. Ass’y light
up to show the cause of the trouble, in addition to the Alarm message on the remote
controller.
LED 2 on
P.C. board
Remote
controller
LED 1 on
P.C. board
Possible cause of trouble
Normal
Outdoor unit serial communication signal is abnormal.
Outdoor unit address is duplicated.
Other outdoor units are performing auto address and
detecting refrigerant shortage.
FMo • CM thermal protection is in operation.
Power supply voltage is abnormal.
High voltage SW activates
Negative phase protector activates.
Sensor is abnormal. (Open or short)
Abnormal compressor current value is detected.
Auto address failure
Auto address is in operation.
NOTE ⅷ: LED lamps OFF ⅜: LED lamps ON (lights up) *: LED lamps ON (blink)
ⅷⅷNo message
ⅷ⅜
E06, E07, L04
ⅷ * No message
⅜ⅷP02
⅜⅜P04, P05
⅜ * F04~F09
* ⅷ H01, H02
**E15, E16
**
“SETTING”
flashes.
Flash at the same time
* REFRIGERANT SHORTAGE
Note particularly that a shortage of refrigerant is only shown by the outdoor P.C.B. Ass’y
LEDs and the Alarm Message does not appear on the Indoor Remote Controller . The
compressor keeps running even when the refrigerant is less, so when you find the LED
indication on the outdoor P.C.B. Ass’y, stop the air conditioner immediately to avoid the
compressor damage.
Fig. IV-2
CAUTION
Flash alternately
Outdoor control PCB
2177_C_I
LED1 (D011)
LED2 (D012)