AEX12GRN
3 – 2
9 AC overcurrent
error
Operating frequency lowers if
compressor AC current exceeds
peak control current value. Com-
pressor stops if compressor AC
current exceeds peak control cur-
rent value at minimum frequency.
When compressor is
in operation
Operation OFF or ON Yes ✩1Yes Yes
10 AC overcurrent
error in compressor
OFF status
Indoor and outdoor units stop if
AC current exceeds about 3 A
while compressor is in non-opera-
tion status.
When compressor is
in non-operation
Replacement of
defective parts such
as IPM
Yes ✩2Yes Yes
11 AC maximum cur-
rent error
Compressor stops if compressor
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
frequency is 50 Hz or higher and
compressor 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
thermistor (TH2) and 2-way valve
thermistor (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 114°C, or if there
is short-circuit in TH1.
When in operation Operation OFF or ON Yes ✩1Yes Yes
15 Outdoor unit heat
exchanger ther-
mistor short-circuit
error
Compressor stops if there is
short-circuit in outdoor unit heat
exchanger thermistor (TH2).
At compressor star-
tup
Operation OFF or ON Yes ✩1Yes Yes
16 Outdoor unit outside
air temperature
thermistor short-cir-
cuit error
Compressor stops if there is
short-circuit in outdoor unit out-
side air temperature thermistor
(TH3).
At compressor star-
tup
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 suc-
tion thermistor (TH4).
At compressor star-
tup
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 star-
tup
Operation OFF or ON Yes ✩1Yes Yes
19 Outdoor unit heat
exchanger ther-
mistor open-circuit
error
Compressor stops if there is
open-circuit in outdoor unit heat
exchanger thermistor (TH2).
At compressor star-
tup
Operation OFF or ON Yes ✩1Yes Yes
20 Outdoor unit outside
air temperature
thermistor open-cir-
cuit error
Compressor stops if there is
open-circuit in outdoor unit out-
side air temperature thermistor
(TH3).
At compressor star-
tup
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 suc-
tion thermistor (TH4).
At compressor star-
tup
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 star-
tup
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 dis-
charge thermistor (TH1).
At compressor star-
tup
Operation OFF or ON Yes ✩1Yes Yes
24 Serial signal error Power relay turns OFF if indoor
unit cannot receive serial signal
from outdoor unit for 8 minutes.
When in operation Operation OFF or ON
(Automatic reset
when less than 8 min-
utes)
Yes None
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
Function Operation Self-diagnosis
result display
Description Detection period Reset condition Indoor
unit error
display
Indoor
unit
Outdoor
unit
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