4. Service procedures
(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 |
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| LED 1 on | Remote | Possible cause of trouble | |||
P.C. board | P.C. board | controller | ||||||
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| ⬤ | No message | Normal | |||
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| ◯ | E06, E07, L04 | Outdoor unit serial communication signal is abnormal. | |||
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| Outdoor unit address is duplicated. | |
⬤ | * | No message | Other outdoor units are performing auto address and | |||||
detecting refrigerant shortage. | ||||||||
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| ⬤ | P02 | FMo • CM thermal protection is in operation. | |||
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| Power supply voltage is abnormal. | ||||||
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| ◯ | P04, P05 | High voltage SW activates | |||
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| Negative phase protector activates. | ||||||
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◯ | * | F04~F09 | Sensor is abnormal. (Open or short) | |||||
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| ⬤ | H01, H02 | Abnormal compressor current value is detected. | |
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| * | E15, E16 | Auto address failure | |||
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| * | “SETTING” | Auto address is in operation. | |||
Flash al | te | rnately | flashes. |
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NOTE
⬤: LED lamps OFF ◯: LED lamps ON (lights up) *: LED lamps ON (blink)
Outdoor control PCB
LED2 (D012)
LED1 (D011)
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2177_C_I | Fig. |
CAUTION
*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.
SM830082
IV - 8
