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17.1.2 CU-Z50UBEA CU-Z60UBEA
CN-HOT
CN-STM1
CN-TH1
CN-MTR1
CN-MTR2
CN-S
CN-TANK
AC-BLK
DATA
AC-WHT
POWER
TRANSISTOR
(IPM)
CURRENT
TRANSFORMER
(CT)
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18. Troubleshooting
Guide
18.1 Refrigeration Cycle System
In order to diagnose malfunctions, make sure that there are no
electrical problems before inspecting the refrigeration cycle.
Such problems include insufficient insulation, problem with the
power source, malfunction of a compressor and a fan.
The normal outlet air temperature and pressure of the refrigeration
cycle depends on various conditions, the standard values for them
are shown in the table on the right.
electrical problems before inspecting the refrigeration cycle.
Such problems include insufficient insulation, problem with the
power source, malfunction of a compressor and a fan.
The normal outlet air temperature and pressure of the refrigeration
cycle depends on various conditions, the standard values for them
are shown in the table on the right.
Difference in the intake
and outlet
air temperatures
More than 8°C
(15 minutes after an
operation is started.)
at cooling mode.
Above 14°C
(15 minutes after an
operation is started.)
at heating mode.
Value of electric
current during operation
Normal
Inefficient compressor
Insufficient refrigerant
Excessive amount
of refrigerant
Dusty condenser
preventing heat radiation
•
Measuring the air temperature
difference
difference
•
Measuring electric current
during operation
during operation
Less than 8°C at the cooling mode
Less than 14°C at the heating mode.
Less than 14°C at the heating mode.
Higher than specified
Gas side
pressure
pressure
Clogged strainer or
capillary tube
•
Measuring gas side pressure
Cooling Mode
High
Lower than specified
Low
Low
Inefficient compressor
Insufficient refrigerant
Clogged strainer, capillary
tube or expansion valve
Heating Mode
Low
Low
High
Normal Pressure and Outlet Air Temperature (Standard)
Gas Pressure
MPa
(kg/cm
2
G)
Outlet air
Temperature
(°C)
Cooling Mode
0.9 ~ 1.2 (9 ~ 12)
13 ~ 17
Heating Mode 2.0 ~ 2.7 (20 ~ 27)
32 ~ 42
*Condition: • Indoor fan speed = High
• Outdoor temperature 35°C at the cooling
mode and 7°C at the heating mode
• Compressor operates at rated frequency
• Compressor operates at rated frequency
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18.1.1 Relationship Between the Condition of the Air Conditioner and Pressure and
Electric Current
Condition of the
air conditioner
Cooling Mode
Heating Mode
Low Pressure
High Pressure
Electric current
during operation
Low Pressure
High Pressure
Electric current
during operation
Insufficient refrigerant
(gas leakage)
Clogged capillary tube or
Strainer
Short circuit in the indoor unit
Heat radiation deficiency
of the outdoor unit
Inefficient compression
• Carry out the measurement of pressure, electric current, and temperature fifteen minutes after an operation is started.
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18.2 Breakdown Self Diagnosis Function
18.2.1 Self Diagnosis Function (Three Digits Alphanumeric Code)
Once abnormality has occurred during operation, the unit will stop its operation, and OFF/ON operation LED OFF.
OFF indicator does not shown on remote control display.
In operation after breakdown repair, the last error code abnormality will be stored in EEPROM.
To make a diagnosis
1. OFF/ON operation LED OFF and the unit automatically stops the operation, but the OFF indicator does not
shown.
2. Press CHECK button continuously for 5 seconds.
3. “- -” will be displayed on the remote controller display.
4. Press
3. “- -” will be displayed on the remote controller display.
4. Press
timer
▲ or ▼ button on the remote control. The error code “H00” (no abnormality) will be displayed.
5. Every press of the button (▲ or ▼) will increase the error code number.
6. When the displayed error code matches the unit's error code, OFF/ON operation LED will be ON
6. When the displayed error code matches the unit's error code, OFF/ON operation LED will be ON
continuously.
7. The breakdown diagnosis mode will be cancelled by pressing CHECK button continuously for 5 seconds or
wait for 30 seconds
AC Reset button
When AC Reset button is pressed, the error code
will be reset so that the unit will be able to operate
and recheck if any error occurred.
will be reset so that the unit will be able to operate
and recheck if any error occurred.
To display memorized error status:
1 Turn ON the power supply.
2 Press CHECK button continuously for 5 seconds.
3 “- -” will be displayed on the remote controller display.
4 Press
2 Press CHECK button continuously for 5 seconds.
3 “- -” will be displayed on the remote controller display.
4 Press
timer
▲ or ▼ button on the remote control. The error code "H00" (no abnormality) will be displayed.
5 Every press of the button (▲ or ▼) will increase the error code number.
6 When the displayed error code matches the unit's error code, OFF/ON operation LED will be ON
6 When the displayed error code matches the unit's error code, OFF/ON operation LED will be ON
continuously.
7 The breakdown diagnosis mode will be cancelled by pressing CHECK button continuously for 5 seconds or
wait for 30 seconds.
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