12LRN
3 – 2
10 AC overcurrent error
in compressor OFF
status
Indoor and outdoor units stop if out-
door AC current exceeds about 3 A
while compressor is in non-opera-
tion status.
When compressor is in
non-operation
Replacement of defec-
tive parts such as IPM
Yes ✩2Yes Yes
11 AC maximum current
error
Compressor stops if coutdoor AC
current exceeds 17 A.
When compressor is in
operation
Operation OFF or ON Yes ✩1Yes Yes
12 AC current defi-
ciency error
Compressor stops if operating fre-
quency is 50 Hz or higher and out-
door AC current is about 2.0 A or
lower.
When compressor is in
operation
Operation OFF or ON Yes ✩1Yes Yes
13 Thermistor installa-
tion error or 4-way
valve error
Compressor stops if high and low
values of temperatures detected by
outdoor unit heat exchanger ther-
mistor (TH2) and 2-way valve ther-
mistor (TH5) do not match
operating cycle.
3 minutes after com-
pressor startup
Operation OFF or ON Yes ✩1Yes Yes
14 Compressor high
temperature error
Compressor stops if compressor
chamber thermistor (TH1) exceeds
about 114C, or if there is short-cir-
cuit in TH1.
When in operation Operation OFF or ON Yes ✩1Yes Yes
15 Outdoor unit heat
exchanger thermistor
short-circuit error
Compressor stops if there is short-
circuit in outdoor unit heat
exchanger thermistor (TH2).
At compressor startup Operation OFF or ON Yes ✩1Yes Yes
16 Outdoor unit outside
air temperature ther-
mistor short-circuit
error
Compressor stops if there is short-
circuit in outdoor unit outside air
temperature thermistor (TH3).
At compressor startup Operation OFF or ON Yes ✩1Yes Yes
17 Outdoor unit suction
thermistor short-cir-
cuit error
Compressor stops if there is short-
circuit in outdoor unit suction ther-
mistor (TH4).
At compressor startup Operation OFF or ON Yes ✩1Yes Yes
18 Outdoor unit 2-way
valve thermistor
short-circuit error
Compressor stops if there is short-
circuit in outdoor unit 2-way valve
thermistor (TH5).
At compressor startup Operation OFF or ON Yes ✩1Yes Yes
19 Outdoor unit heat
exchanger thermistor
open-circuit error
Compressor stops if there is open-
circuit in outdoor unit heat
exchanger thermistor (TH2).
At compressor startup Operation OFF or ON Yes ✩1Yes Yes
20 Outdoor unit outside
air temperature ther-
mistor open-circuit
error
Compressor stops if there is open-
circuit in outdoor unit outside air
temperature thermistor (TH3).
At compressor startup Operation OFF or ON Yes ✩1Yes Yes
21 Outdoor unit suction
thermistor open-cir-
cuit error
Compressor stops if there is open-
circuit in outdoor unit suction ther-
mistor (TH4).
At compressor startup Operation OFF or ON Yes ✩1Yes Yes
22 Outdoor unit 2-way
valve thermistor
open-circuit error
Compressor stops if there is open-
circuit in outdoor unit 2-way valve
thermistor (TH5).
At compressor startup Operation OFF or ON Yes ✩1Yes Yes
23 Outdoor unit dis-
charge thermistor
open-circuit error
Compressor stops if there is open-
circuit in outdoor unit discharge
thermistor (TH1).
At compressor startup Operation OFF or ON Yes ✩1Yes Yes
24 Serial signal error Compressor stops if outdoor unit
cannot receive serial signal from
indoor unit for 30 seconds.
When in operation Reset after reception of
serial signal
None None None
25 Compressor startup
error
Compressor stops if compressor
fails to start up.
At compressor startup Operation OFF or ON Yes ✩3Yes Yes
26 Compressor rotation
error (at 120 ener-
gizing)
Compressor stops if there is no
input of position detection signal
from compressor or input is abnor-
mal.
Compressor operating
at 120 energizing
Operation OFF or ON Yes ✩3Yes Yes
27 Outdoor unit DC fan
error
Operation stops if there is no input
of rotation pulse signal from out-
door unit fan motor for 30 seconds.
When outdoor unit fan
is in operation
Operation OFF or ON Yes ✩1Yes Yes
28 PAM overvoltage
error
Compressor stops if DC voltage is
400 V or higher.
When in operation Operation OFF or ON Yes ✩1Yes Yes
Function Operation Self-diagnosis result
display
Description Detection period Reset condition Indoor
unit error
display
Indoor
unit
Outdoor
unit
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