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Error Codes Table
Diagnosis
display
Abnormality / Protection control Abnormality
Judgement
Emergency
operation
Primary location to verify
H11 Indoor / outdoor abnormal
communication
> 1 min after starting
operation
Indoor fan operation
only
• Internal / external cable connections
• Indoor / Outdoor PCB
H12 Connection capability rank abnormal — — —
H14 Indoor intake air temperature sensor
abnormality
Continue for 5 sec. —
• Intake air temperature sensor
(defective or disconnected)
H15 Outdoor compressor temperature sensor
abnormality
Continue for 5 sec. —
• Compressor temperature sensor
(defective or disconnected)
H16 Outdoor Current Transformer open
circuit
— —
• Outdoor PCB
• IPM (Power transistor) module
H19 Indoor fan motor merchanism lock — —
• Indoor PCB
• Fan motor
H21 Indoor float switch operation abnormal — — —
H23 Indoor heat exchanger temperature
sensor abnormality
Continue for 5 sec. O
(Cooling only)
• Heat exchanger temperature sensor
(defective or disconnected)
H27 Outdoor air temperature sensor
abnormality
Continue for 5 sec. O
• Outdoor temperature sensor
(defective or disconnected)
H28 Outdoor heat exchanger temperature
sensor abnormality
Continue for 5 sec. O
• Outdoor heat exchanger
temperature sensor (defective or
disconnected)
H30 Discharge temperature sensor
abnormality
Continue for 5 sec. —
• Discharge temperature sensor
H33 Indoor/Outdoor wrong connection — —
• Indoor/Outdoor supply voltage
H35 Indoor drain water adverse current
abnormal
— — —
H38 Indoor/Outdoor mismatch (brand code) — — —
H97 Outdoor Fan Motor lock abnormality — —
• Outdoor PCB
• Outdoor Fan Motor
H98 Indoor high pressure protection — —
• Air filter dirty
• Air circulation short circuit
H99 Indoor heat exchanger anti-freezing
protection
— —
• Insufficient refrigerant
• Air filter dirty
F11 Cooling / Heating cycle changeover
abnormality
4 times occurance
within 30 minutes
—
• 4-way valve
• V-coil
F90 PFC control 4 times occurance
within 10 minutes
—
• Voltage at PFC
F91 Refrigeration cycle abnormality 7 times occurance
continuously
—
• No refrigerant
(3-way valve is closed)
F93 Outdoor compressor abnormal revolution 4 times occurance
within 20 minutes
—
• Outdoor compressor
F95 Cool high pressure protection 4 times occurance
within 20 minutes
—
• Outdoor refrigerant circuit
F96 IPM (power transistor) overheating
protection
— —
• Excess refrigerant
• Improper heat radiation
• IPM (Power transistor)
F97 Outdoor compressor overheating
protection
4 times occurance
within 20 minutes
—
• Insufficient refrigerant
• Compressor
F98 Total running current protection 3 times occurance
within 20 minutes
—
• Excess refrigerant
• Improper heat radiation
F99 Outdoor Direct Current (DC) peak
detection
7 times occurance
continuously
—
• Outdoor PCB
• IPM (Power transistor)
• Compressor
Note:
“O” - Frequency measured and fan speed fixed.
The memory data of error code is erased when the power supply is cut off, or press the Auto Switch until “beep” sound heard
following by pressing the “RESET” button at Remote Control.
Although operation forced to stop when abnormality detected, emergency operation is possible for certain errors (refer to Error
Codes Table) by using Remote Control or Auto Switch at indoor unit. However, the Remote Control signal receiving sound is
changed from one “beep” to four “beep” sounds.
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CS-E15DB4EW CU-E15DBE / CS-E18DB4EW CU-E18DBE / CS-E21DB4ES CU-E21DBE