PACD011001C2
Troubleshooting UM Combination “MA1R Series” Using R-407C 481
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1. Operation Flowcharts..........................................................................483
1.1 Indoor Unit Operation Flowchart ..........................................................483
2. Troubleshooting by Remote Controller ...............................................488
2.1 The INSPECTION / TEST Button.........................................................488
2.2 Self-diagnosis by Wired Remote Controller .........................................489
2.3 Self-diagnosis by Wireless Remote Controller.....................................490
2.4 Operation of The Remote Controller’s Inspection /
Test Operation Button ..........................................................................493
2.5 Remote Controller Service Mode .........................................................494
2.6 Remote Controller Self-Diagnosis Function
(Display of Malfunction Code) ..............................................................496
3. Troubleshooting ..................................................................................498
3.1 Indoor Unit: Error of External Protection Device ..................................498
3.2 Indoor Unit: PC Board Defect...............................................................499
3.3 Indoor Unit: Malfunction of Drain Level Control System (33H).............500
3.4 Indoor Unit: Fan Motor (M1F) Lock, Overload......................................501
3.5 Indoor Unit: Malfunction of Swing Flap Motor (M1S)............................502
3.6 Indoor Unit: Malfunction of Moving Part of
Electronic Expansion Valve (Y1E)........................................................503
3.7 Indoor Unit: Drain Level above Limit ....................................................504
3.8 Indoor Unit: Malfunction of Capacity Determination Device.................505
3.9 Indoor Unit: Malfunction of Thermistor (R2T) for Liquid Pipe...............506
3.10 Indoor Unit: Malfunction of Thermistor (R3T) for Gas Pipes ................507
3.11 Indoor Unit: Malfunction of Thermistor (R1T) for Air Inlet.....................508
3.12 Indoor Unit: Malfunction of Thermostat Sensor in Remote Controller..509
3.13 Outdoor Unit: Actuation of Safety Device.............................................510
3.14 Outdoor Unit: PC Board Defect............................................................511
3.15 Outdoor Unit: Actuation of High Pressure Switch.................................512
3.16 Outdoor Unit: Actuation of Low Pressure Switch .................................513
3.17 Outdoor Unit: Malfunction of Moving Part of
Electronic Expansion Valve (Y1E)........................................................514
3.18 Outdoor Unit: Abnormal Discharge Pipe Temperature.........................515
3.19 Outdoor Unit: Malfunction of Thermistor (R1T) for Outdoor Air............516
3.20 Outdoor Unit: Malfunction of Discharge Pipe Thermistor (R3T)...........517
3.21 Outdoor Unit: Malfunction of Thermistor (R4T) for Suction Pipe..........518
3.22 Outdoor Unit: Malfunction of Thermistor (R2T) for Heat Exchanger ....519
3.23 Outdoor Unit: Malfunction of Discharge Pipe Pressure Sensor ...........520
3.24 Outdoor Unit: Malfunction of Suction Pipe Pressure Sensor................521
3.25 Low Pressure Drop Due to Refrigerant Shortage or
Electronic Expansion Valve Failure......................................................522
3.26 Negative Phase, Open Phase..............................................................523
3.27 Malfunction of Transmission Between Indoor Units .............................524
3.28 Malfunction of Transmission
Between Remote Controller and Indoor Unit........................................525
3.29 Malfunction of Transmission Between Outdoor Units ..........................526
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