SiUS041501E Troubleshooting with LED
Service Diagnosis 56
2. Troubleshooting with LED
2.1 Indoor Unit
Operation Lamp 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.
2.2 Outdoor Unit
The outdoor unit has one green LED (LED A) on the PCB. When the microcomputer works in order,
the LED A blinks. However, the LED A turns OFF while the standby electricity saving function is
activated and the power supply is OFF. (Refer to page 20, 21 for the location of LED A.)
ON/OFF
Operation lamp
(green)
(R21056)
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