Malfunction diagnosis indications, descriptions, inspection methods and remedies
: Flashes in 2-sec intervals (normal)
*3: The content of diagnosis is transferred to the indoor unit via serial communication, but it does not trigger a complete shutdown operation. Number of repetition °: No complete shutdown
: On : Off : Flashes 3 times in 0.2-sec intervals
Status of
indoor/
outdoor units
Indication
by LED on
outdoor
unit
Indication by operation lamp on indoor unit
Content of diagnosis
Main category Sub-category
(1) Measure resistance of the outdoor unit
thermistor.
(2) Check the lead wire of the outdoor unit
thermistor for torn sheath and short-cir-
cuit.
(3) No abnormality found in above inspec-
tions (1) and (2).
(1) Replace the outdoor unit thermistor
assembly.
(2) Replace the outdoor unit thermistor
assembly.
(3) Replace the outdoor unit control
PWB assembly.
(1) Check the outdoor unit air outlet for
blockage.
(2) Check if the power supply voltage is 216
V or higher at full power.
(3) Check the pipe connections for refriger-
ant leaks.
(4) Measure resistance of the outdoor com-
pressor thermistor.
(TH1: Approx. 53 k at 25ºC)
(5) Check the expansion valve for proper
operation.
(Temporary stop for cycle protection)
(1) Ensure unobstructed air flow from
the outdoor unit air outlet.
(2) Connect power supply of proper
voltage.
(3) Charge the specified amount of re-
frigerant.
(4) Replace the outdoor unit compres-
sor thermistor assembly.
(5) Replace the expansion valve coil,
expansion valve or outdoor unit
control PWB assembly.
(1) Measure resistance of the heat
sink thermistor.
(1) Replace the heat sink
thermistor.
Inspection location/method Remedy
Normal
Heat exchanger
thermistor short-
circuit error
Outdoor tempera-
ture thermistor
short circuit error
Suction thermistor
short circuit error
Compressor high
temperature error
Temporary stop due
to compressor dis-
charge overheat *3
(Temporary stop for cycle protection)
Temporary stop due
to outdoor unit heat
exchanger overheat
*3
(Temporary stop for cycle protection)
Temporary stop due
to indoor unit heat
exchanger overheat
*3
(Temporary stop for parts protection)
Temporary stop due
to IPM overheat *3
IPM high temper-
ature error
Lighting pattern at the time of timer lamp lighting
Off for 5 seconds
Operation lamp
Cluster lamp
Outdoor unit
thermistor
short-circuit
Cycle tempera-
ture
Operation lamp
Cluster lamp
Operation lamp
Cluster lamp
Operation lamp
Cluster lamp
Operation lamp
Cluster lamp
Operation lamp
Cluster lamp
Operation lamp
Cluster lamp
Operation lamp
Cluster lamp
Operation lamp
Cluster lamp
Indoor/
outdoor units
in operation
Normal
flashing
1 time
2 time
Indoor/
outdoor units
in complete
shutdown
Indoor/
outdoor units
in complete
shutdown
Indoor unit in
operation
Outdoor unit
in temporary
stop
Main
category
Sub
category
Malfunction No.
00
10
2
20
30
1
2
3
4
5
1
(Temporary stop for cycle protection)Temporary stop
due to dehumidi-
fying operation *3
Dry operationOperation lamp
Cluster lamp
3 time
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