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Troubleshooting
1.2 Troubleshooting Procedure
● Alarm Code Indication of Remote Control Switch
Refrigeration Cycle No. of Indoor
Unit which Abnormality Occurs
Indoor Unit No. which Abnormality
Occurs
Alarm Code
Total No. of Indoor Unit in
the same Refrigeration Cycle
as one Abnormality Occurs
1.2.1 Alarm Code Table
Code Category Content of Abnormality Leading Cause
01 Indoor Unit Activation of Protection Device (Float Switch)
Activation of Float Switch
(High Water Level in Drain Pan,
Abnormality of Drain Pipe, Float Switch or Drain Pan)
02 Outdoor Unit Activation of Protection Device (High Pressure Cut)
Activation of PSH (Pipe Clogging, Excessive Refrigerant, Inert
Gas Mixing)
03
Transmission
Abnormality between Indoor and Outdoor
Incorrect Wiring, Loose Terminals, Disconnect Wire, Blowout of
Fuse, Outdoor Unit Power OFF
04
Abnormality between Inverter PCB and Outdoor Unit
PCB
Inverter PCB - Outdoor Unit PCB Transmission Failure (Loose
Connector, Wire Breaking, Blowout of Fuse)
04.
Abnormality between Fan Controller and Outdoor Unit
PCB
Fan Controller - Outdoor Unit PCB Transmission Failure (Loose
Connector, Wire Breaking, Blowout of Fuse)
05 Supply Phase Abnormality Power Supply Phases
Incorrect Power Supply, Connection to Reversed Phase, Open-
Phase
06 Voltage Abnormal Inverter Voltage Outdoor Voltage Drop, Insucient Power Capacity
06. Abnormal Fan Controller Voltage Outdoor Voltage Drop, Insucient Power Capacity
07
Cycle
Decrease in Discharge Gas Superheat
Excessive Refrigerant Charge, Failure of Thermistor, Incorrect
Wiring, Incorrect Piping Connection, Expansion Valve Locking
at Opened Position (Disconnect Connector)
08 Increase in Discharge Gas Temperature
Insucient Refrigerant Charge, Pipe Clogging Failure of
Thermistor, Incorrect Wiring, Incorrect Piping Connection,
Expansion Valve Locking at Closed Position (Disconnect
Connector)
0A Transmission Abnormality between Outdoor and Outdoor Incorrect Wiring, Breaking Wire, Loose Terminals
0b
Outdoor Unit
Incorrect Outdoor Unit Address Setting
Duplication of Address Setting for Outdoor Units (Sub Units) in
Same Refrigerant Cycle System
0C Incorrect Outdoor Unit Main Unit Setting
Two (or more) Outdoor Units Set as “Main Unit” Exist in Same
Refrigerant Cycle System
11
Sensor on
Indoor
Unit/Water
Module/
Controller
Inlet Air Thermistor/ Inlet Water Thermistor
Incorrect Wiring, Disconnecting Wiring Breaking Wire, Short
Circuit
12 Outlet Air Thermistor/ Outlet Water Thermistor
13 Freeze Protection Thermistor
14 Gas Piping Thermistor
15
Abnormality of Indoor Air Thermistor (Total Heat
Exchanger)
16 Abnormality of Remote Control Thermistor
17 Abnormality of Thermistor in Wire Controller
19 Fan Motor Activation of Protection Device for Indoor Fan Fan Motor Overheat, Locking
21
Sensor on
Outdoor Unit
High Pressure Sensor
Incorrect Wiring, Disconnecting Wiring Breaking Wire, Short
Circuit
22 Outdoor Air Thermistor
23 Discharge Gas Thermistor on Top of Compressor
24 Heat Exchanger Liquid Pipe Thermistor
25 Heat Exchanger Gas Pipe Thermistor
29 Low Pressure Sensor
31
System
Incorrect Capacity Setting of Outdoor Unit and Indoor
Unit/water module
Incorrect Capacity Code Setting of Combination Excessive or
Insucient Indoor Unit /Water Module Total Capacity Code
Abnormal Transmitting between Outdoor Units
35 Incorrect Setting of Indoor Unit No. Duplication of Indoor Unit No. in same Ref. Gr.
36 Incorrect of Indoor Unit Combination Indoor Unit is Designed for R22
37 Incorrect Number Setting of Connected Water Module
Function Setting Value of n3 Unequal the Number of
Connected Water Module Or Abnormal Power Supply For
Water Module
38 System
Abnormality of Picking up Circuit for Protection in
Outdoor Unit
Failure of Protection Detecting Device (Incorrect Wiring of
Outdoor Unit PCB)
39 Compressor
Abnormal Running Current in Constant Speed
Compressor
Overcurrent, Blowout of Fuse, Current Sensor Failure
Instantaneous Power Failure
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