AEX12GRN
3 – 3
✩1—The outdoor unit restarts four times before the indoor unit error is displayed (complete shutdown).
✩2—A single error judgment results in the display of the indoor unit error (complete shutdown).
✩3—The outdoor unit restarts eight times before the indoor unit error is displayed (complete shutdown).
[2] AIR CONDITIONER OPERATION IN THERMISTOR ERROR
1. Indoor unit
25 Compressor star-
tup error
Compressor stops if compressor
fails to start up.
At compressor star-
tup
Operation OFF or ON Yes ✩3Yes Yes
26 Compressor rota-
tion error (at 120°
energizing)
Compressor stops if there is no
input of position detection signal
from compressor or input is
abnormal.
Compressor operat-
ing 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
outdoor unit fan motor for 30 sec-
onds.
When outdoor unit
fan is in operation
Operation OFF or ON Yes ✩1Yes Yes
28 PAM overvoltage
error
Compressor stops if DC voltage is
350 V or higher.
When in operation Operation OFF or ON Yes ✩1Yes Yes
29 PAM clock error When power source frequency
cannot be determined (at startup),
or when power source clock can-
not be detected for 1 continuous
second (at startup).
At compressor star-
tup, when in opera-
tion
Compressor contin-
ues operation with-
out stopping.
None Yes Yes
30 IPM pin level error When Outdoor unit starts to run,
MCU checks 6 control pin levels
of IPM. If MCU detects some pin
levels isn’t different from another
pin level. MCU doesn’t run Com-
pressor.
At compressor star-
tup
Operation OFF or ON Yes ✩1Yes Yes
Item Mode Control opera-
tion
When resistance is
low (temperature
judged higher than
actual)
Short-circuit When resistance
is high (tempera-
ture judged lower
than actual)
Open-circuit
Room tempera-
ture thermistor
(TH1)
Auto Operation mode
judgment
Cooling mode is acti-
vated even if room
temperature is low.
Cooling mode is acti-
vated in most cases.
Heating mode is
activated even if
room temperature is
high.
Heating mode is
always activated.
Cooling Frequency control Room becomes too
cold.
Air conditioner oper-
ates in full power
even when set tem-
perature is reached.
Room does not
become cool.
Compressor does
not operate.
Dehumidifying Room tempera-
ture memory
Frequency control
Normal operation. Room temperature is
stored in memory as
31.0°C, and com-
pressor does not
stop.
Normal operation. Room tempera-
ture is stored in
memory as
18.5°C, and com-
pressor does not
operate.
Heating Frequency control Room does not
become warm.
Hot keep status
results immediately
after operation starts.
Frequency does not
increase above 30 Hz
(40 Hz).
Room becomes too
warm.
Air conditioner
operates in full
power even when
set temperature is
reached.
Heat exchanger
thermistor (TH2)
Cooling
Dehumidifying
Freeze preven-
tion
Indoor unit evapora-
tor may freeze.
Indoor unit evapora-
tor may freeze.
Compressor stops
occasionally.
Compressor does
not operate.
Heating Cold air preven-
tion
Cold air prevention
deactivates too soon
and cold air dis-
charges.
Compressor operates
at low speed or stops,
and frequency does
not increase.
Cold air prevention
deactivates too
slow.
Cold air preven-
tion does not
deactivate, and
indoor unit fan
does not rotate.
Function Operation Self-diagnosis
result display
Description Detection period Reset condition Indoor
unit error
display
Indoor
unit
Outdoor
unit
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