12.1. General notes ...................................................................................................................................... 456

12.1.1. Checking the power source and the wiring connection ........................................................................... 456

12.1.2. Burnt-out compressor due to an insufficient refrigerant charge ............................................................... 456

12.1.3. Insufficient cooling performance when a long piping is applied ............................................................... 457

12.1.4. Abnormally high operation sound (in the ceiling type indoor unit). .......................................................... 457

12.1.5. Alarm code "31" ....................................................................................................................................... 458

12.1.6. Not cooling well due to insufficient installation space for the outdoor unit ............................................... 458

12.2. Maintenance work ............................................................................................................................... 459

12.3. Service and maintenance record......................................................................................................... 460

12.4. Service and maintenance record using the 7-segment display ........................................................... 461

12.5. Service and maintenance record by remote control switch ................................................................. 463

12.6. Pump-down method for replacing the compressor.............................................................................. 464

455

SMGB0079 rev.0 - 01/2013

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. M a i n t e n a n c e n o t e s

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