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Diagnosis
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Abnormality /
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Diagnosis Method
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Diagnosis Checkpoint
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Display
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Protection Control
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H11
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Indoor/Outdoor
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This trouble display appears when indoor/outdoor unit communication
fails to be established after 30 or more
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Measure the voltages of the indoor/outdoor unit communication cables,
and check whether the voltage is being
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abnormal
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seconds.
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supplied properly to the outdoor unit or whether it is being returned
from the outdoor unit to the indoor units.
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communication
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H12
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Indoor unit capacity
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This trouble display appears when wrong in the total connection
capacity and wrong connection in each capacity.
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Check the total capacity of the units connected and check that the
models are compatible for connection.
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unmatched
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The trouble is determined within 2 minutes after the power is turned
on.
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H14
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Intake air temp.
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This trouble display appears when the intake air temperature has
exceeded above 46ºC continuously for 2 minutes
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This trouble display appears when a temperature which is impossibly
high or low from a normal standpoint has
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sensor
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or dropped below -54ºC continuously for 5 seconds during operation.
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been detected. Check the sensor, and if open-circuiting (0L or ∞)
or short-circuit is not found, defective contact of
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the connector is to blame.
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H15
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Outdoor compressor
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—
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Check the sensor, and if open-circuit (more than 500 k) or
(short-circuit) (less than 6.5 k) is not found, defective
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temperature sensor
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contact of the connector is to blame.
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abnormality
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H16
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Outdoor Current
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CU-2E: When a value of under 1.5A has been detected for the total
current during operation beyond the set
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1. Check the refrigerant cycle: Gas may be leaking (the amount of
refrigerant is extremely low).
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Transformer
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capacity, the compressor operates with its operating frequency
controlled to a maximum of 38Hz for 3 minutes,
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2. Check the control PCB: Check for a broken wire (open circuit) in the
current transformer. (If an open circuit is
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and if it continues to operate at a total current of under 1.5A for
another 3 minutes, its operation stops.
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found, replace the control PCB) In the case of a scroll compressor (DC
motor), H16 is detected only when the
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CU-3E/4E: When the total current has dropped below the set current
level continuously for 20 seconds during
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regular compressor is operating.
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operation beyond the set capacity, operation is stopped. Three minutes
later, operation is started up again, and
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when the trouble occurs on 4 successive occasions, the trouble display
appears (the timer lamp blinks).
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H19
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Indoor fan motor
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· High-voltage PWM: When a state in which the fan motor speed is not
synchronized with the control signal has been
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1. Check the nature of the fan lockup trouble.
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mechanism lock
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detected on 7 successive occasions.
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2. Check for disconnections of the fan motor connectors and for defects
in contact, in the fan motor and in the
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· Low-voltage PAM: When the fan lock detection signal has been
detected on 7 successive occasions or it has been
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control PCB.
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detected continuously for 25 seconds or when a state in which the fan
motor speed is not synchronized with the control
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signal has been detected on 7 successive occasions: The trouble display
appears (the timer lamp blinks).
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H23
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Indoor heat exchanger
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This trouble display appears when a temperature of under approximately
-40ºC or above approximately 80ºC has
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This trouble display appears when a temperature which is impossibly
high or low from a normal standpoint has
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temp. sensor
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been detected by the heat exchanger temperature sensor continuously for
5 seconds. (This trouble is not detected
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been detected. Check the sensor, and if (open-circuit) (0L or ∞)
or short-circuit is not found, defective contact of
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during de-icing.)
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the connector or a defective control PCB is to blame.
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H26
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Ionizer Abnormality
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—
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1. Measure the voltages of the indoor unit communication cables, and
check whether the voltage is being supplied
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properly. 2. Check the ionizer needle and grounding plate is dust free.
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H27
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Outdoor air temp.
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This trouble display appears when a temperature of under approximately
-40ºC or above approximately 150ºC has
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This trouble display appears when a temperature which is impossibly
high or low from a normal standpoint has
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sensor
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been detected by the outside air temperature sensor for 2 to 5 seconds.
(This trouble is not detected during
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been detected. Check the sensor, and if open-circuiting (0L or ∞)
or short-circuit isnot found, defective contact of
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de-icing.)
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the connector or a defective control PCB is to blame.
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H28
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Outdoor heat
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This trouble display appears when a temperature of under approximately
-60ºC or above approximately 110ºC has
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This trouble display appears when a temperature which is impossibly
high or low from a normal standpoint has
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exchanger temp.
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been detected by the heat exchanger temperature sensor for 2 to 5
seconds. (This trouble is not detected during
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been detected. Check the sensor, and if open-circuiting (0L or ∞)
or short-circuit is not found, defective contact of
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sensor 1
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de-icing.)
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the connector or a defective control PCB is to blame.
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H30
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Outdoor discharge
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CU-2E: This trouble display appears when a temperature of under
approximately -16ºC or above approximately
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This trouble display appears when a temperature which is impossibly
high or low from a normal standpoint has
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pipe temp. sensor
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200ºC has been detected by the outlet temperature sensor for 2 to 5
seconds.
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been detected. Check the sensor, and if open-circuiting (0L or ∞)
or short-circuit is not found, defective contact of
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CU-3E/4E: Disconnected discharge sensor · When the condensation
temperature is higher than the discharge
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the connector or a defective control PCB is to blame.
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temperature + (plus) 6ºC, a sensor disconnection is detected,
operation stops, and the trouble display appears
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(the timer lamp blinks).
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H32
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Outdoor heat exchanger
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This trouble display appears when a temperature of under approximately
-60ºC or over approximately 110ºC has
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This trouble display appears when a temperature which is impossibly
high or low from a normal standpoint has
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temp. sensor 2
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been detected continuously for 2 to 5 seconds by the outlet temperature
sensor of the heat exchanger.
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been detected. Check the sensor, and if open-circuiting (0L or ∞)
or short-circuit is not found, defective contact of
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(discharge pipe temp.)
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the connector or a defective control PCB is to blame.
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H33
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Indoor / Outdoor
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Indoor / Outdoor different model junction, 100V charge into 200V
outdoor unit.
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Check whether the voltage is being supplied properly to the outdoor
unit or whether it is being returned from the
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wrong connection
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outdoor unit to the indoor units.
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H34
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Outdoor heat sink
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This trouble display appears when a temperature of under -43ºC or
above 80ºC has been detected by the outdoor
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This trouble display appears when a temperature which is impossibly
high or low from a normal standpoint has
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temp. sensor
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unit radiator fin sensor continuously for 2 seconds.
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been detected. Check the sensor, and if open-circuiting (0L or ∞)
or short-circuit is not found, defective contact of
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the connector or a defective control PCB is to blame.
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H36
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Abnormal gas pipe
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This trouble display appears when a temperature of under approximately
-45ºC or above approximately 149ºC has
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This trouble display appears when a temperature which is impossibly
high or low from a normal standpoint has
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temp. sensor
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been detected by the outdoor unit gas side pipe temperature sensor
continuously for 2 to 5 seconds.
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been detected. Check the sensor, and if open-circuiting (0L or ∞)
or short-circuit is not found, defective contact of
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the connector or a defective control PCB is to blame.
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H37
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Outdoor liquid pipe
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This trouble display appears when a temperature of under -45ºC or
above 149ºC has been detected by the outdoor
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This trouble display appears when a temperature which is impossibly
high or low from a normal standpoint has
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temp. sensor
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unit liquid side pipe temperature sensor continuously for 2 seconds.
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been detected. Check the sensor, and if open-circuiting (0L or ∞)
or short-circuit is not found, defective contact of
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the connector or a defective control PCB is to blame.
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H38
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Indoor / Outdoor
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—
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—
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mismatch (brand code)
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H39
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Abnormal indoor
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This display appears in rooms other than one in which indoor freezing
trouble has occurred when the pipes have
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—
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operating unit or
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been connected incorrectly, when an outdoor expansion valve is
defective or when an expansion valve connector
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standBy units
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has become disconnected.
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H41
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Abnormal wiring or
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CU-2E only This display appears when this kind of trouble is detected 3
minutes after a forced cooling operation
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—
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piping connection
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was conducted for one room during the initial operation after the power
was turned on. It appears when:
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· The indoor unit pipe temperature in a room without the capacity
supply available at an outside air temperature
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above 5ºC has dropped by more than 20ºC to 5ºC or lower 3 minutes
after the compressor started up. · The
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outdoor unit gas pipe temperature in a room without the capacity supply
available has dropped by more than 5ºC
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to 5ºC or lower 3 minutes after the compressor started up.
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H50
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Ventilation failure
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This display appears when ventilation motor is lock.
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1. Check the voltage drop at pin 1 & 2 of CNVENT to have 14Vdc. 2.
Check the ventilation hose condition from
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ventilation opening until tip cover. 3. Check air fl ow from tip cover
by hand.
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