: Flashes in 2-sec intervals (normal) : 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) Check the connector of the outdoor unit
thermistor for secure installation.
(2) Measure resistance of the outdoor ther-
mistor.
(3) Check the lead wire of the outdoor unit
thermistor.
(4) No abnormality found in above inspec-
tions (1) through (3).
(1) IPM continuity check
(2) Check the IPM and heat sink for secure
installation.
(3) Check the outdoor unit fan motor for
proper rotation.
(4) No abnormality found in above inspec-
tions (1) through (3).
(5) No abnormality found in above inspec-
tions (1) through (4).
(1) Check the outdoor unit air outlet for
blockage.
(2)
Check the outdoor unit fan for proper rotation.
(1) Check the outdoor unit air outlet for
blockage.
(2)
Check the outdoor unit fan for proper rotation.
(1) Check if there is an open-circuit in the
secondary winding of the current trans-
former of the outdoor unit control PWB.
(2) Check if the refrigerant volume is abnor-
mally low.
(3) Check if the refrigerant flows properly.
(1) Correct the installation.
(2) Replace the outdoor unit thermistor
assembly.
(3) Replace the outdoor unit thermistor
assembly.
(4) Replace the outdoor unit control
PWB assembly.
(1) Replace the outdoor unit control
PWB assembly.
(2) Correct the installation (tighten the
screws). Apply silicon grease.
(3) Replace the outdoor unit fan motor.
(4) Replace the outdoor unit control
PWB assembly.
(5) Replace the compressor.
(1) Ensure unobstructed air flow from
the outdoor unit air outlet.
(2) Check the outdoor unit fan motor.
(1) Ensure unobstructed air flow from
the outdoor unit air outlet.
(2) Check the outdoor unit fan motor.
(1) Replace the outdoor unit control
PWB assembly.
(2)
Charge the specified amount of refriger-
ant.
(3)
Correct refrigerant clogs. (2-way valve,
3-way valve, pipe, expansion valve)
Inspection location/method Remedy
Heat exchanger
thermistor open-
circuit error
Outdoor tempera-
ture thermistor
open circuit error
Suction thermistor
open-circuit error
Discharge thermis-
tor open circuit error
DC overcurrent er-
ror
AC overcurrent er-
ror
AC maximum cur-
rent error
AC current defi-
ciency error
Lighting pattern at the time of timer lamp lighting
Off for 5 seconds
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
Outdoor unit
thermistor
short-circuit
Outdoor unit DC
Outdoor unit AC
5 time
6 time
7 time
9 time
Indoor/
outdoor units
in complete
shutdown
*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
Main
category
Sub
category
Malfunction No.
50
1
2
4
60
70
0
3
1
4
2
3
Operation lamp
Clus
t
e
rlamp
4 way valve error
or Gas leak error
(1)
C
heck to
make sure outdoor unit ther
mis
tor
TH2(exch
ange) and TH
3(p
i
pe temperature)
are instal
led in correct portions.
(2)
C
h
eck if
t
h
ere
figerant volum
e
is abnomallylow
.
(3)
C
heck the 4-way
valve for proper
op
eration
.
(1) Correct the ins
ta
llation.
(2)
Change the speccified amount of refrigerant.
(3) Replace the
4-way v
a
l
v
e.
Cyc
l
e
temperature
AC overcurrent er-
ror in OFF status
(1) IPM continuity check
(1)
Replace the outdoor unit control PWB
assembly.
Operation lamp
Cluster lamp
Outdoor unit
cooling/heating
switchover
Thermistor install-
tion error or 4-way
valve error
(1)
Check to make sure outdoor unit thermistor
TH2 (heat exchanger) and TH (2-way valve)
are installed in correct posittions.
(2)
Measure resistance of thermistor TH1
and TH5.
(3)
Check the 4-way valve for proper operation.
(4)
No abnormality found in above inspections (1)
through (3)
(1) Correct the installation.
(2) Replace the thermistor assembly.
(3) Replace the 4-way valve.
(4)
Replace the outdoor unit control PWB
assembly.
Operation lamp
Cluster lamp
Torque control
error
(1) Check if the refrigerant volume is
abnormally low.
(2) Check the 4-way valve for proper
operation.
(3) Check to see compressor type is correct
(1) Change the speccified amount of
refrigerant.
(2) Replace the 4-way valve.
(3) Replace the compressor with correct.
Operation lamp
Cluster lamp
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