Sharp AH-MP20, Service Manual

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[3] DIAGNOSIS PROCEDURE
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When the louver unit is not properly installed, all lamps on the indicator panel will blink operation are all stop and Remote signal is not accept.
Timing chart of Timer LED and Operation LED of DIAGNOSIS PROCEDURE.
When "OI" button the remote controller or "AUX." button in the unit is pushed, the unit is free from DIAGNOSIS
PROCEDURE
When indoor fan motor is out of order or compressor lock occurs, indoor fan motor, outdoor fan motor, and louver are all stopped and the
operation LED(red) turns on or off synchronously with the timimg of the timer LED.
When the thermistor for room temperature or pipe temperature is open or short state, the operation LED turns on or off synchrnoously with the
timing of the timer LED by pushing continously for more than 5 seconds "AUX." button during suspension of operation.