SiENBE05-722_A Caution for Diagnosis
Service Diagnosis 63
1. Caution for Diagnosis
1.1 Troubleshooting with LED
Indoor Unit The operation lamp blinks when any of the following errors is detected.
1. When a protection device of the indoor or outdoor unit is activated, or when the thermistor
malfunctions.
2. When a signal transmission error occurs between the indoor and outdoor units.
In either case, conduct the diagnostic procedure described in the following pages.
Outdoor Unit The outdoor unit has one green LED (LED A) on the PCB. When the LED A blinks, the
microcomputer works in order.
O
N
O
F
F
(R2974)
Operation lamp (green)
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