12KHR-N
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 TO AIR HEAT PUMP OPERATION IN THERMISTOR ERROR
1. Indoor unit
26
Compressor rota-
tion error (at 120
q
energizing)
Compressor stops if there is no
input of position detection signal
from compressor or input is
abnormal.
Compressor operat-
ing at 120
q
energizing
Operation OFF or ON
Yes
✩
3
Yes
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
✩
1
Yes
Yes
28
PAM overvoltage
error
Compressor stops if DC voltage is
400 V or higher.
When in operation
Operation OFF or ON
Yes
✩
1
Yes
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
Item
Mode
Control opera-
tion
When resis-
tance is low
(temperature
judged higher
than actual)
Short-circuit
When resis-
tance is high
(temperature
judged lower
than actual)
Open-circuit
Room tempera-
ture thermistor
(TH1)
Auto
Operation mode
judgment
Cooling mode is
activated even if
room tempera-
ture is low.
Cooling mode is
activated in most
cases.
Heating mode is
activated even if
room tempera-
ture is high.
Heating mode is
always activated.
Cooling
Frequency control
Room becomes
too cold.
Air conditioner
operates in full
power even when
set temperature is
reached.
Room does not
become cool.
Compressor does
not operate.
Dehumidifying
Room tempera-
ture memory
Frequency control
Normal operation.
Room tempera-
ture is stored in
memory as
31.0
q
C, and com-
pressor does not
stop.
Normal operation.
Room tempera-
ture is stored in
memory as
18.5
q
C, and com-
pressor does not
operate.
Heating
Frequency control
Room does not
become warm.
Hot keep status
results immedi-
ately after opera-
tion 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 evap-
orator may
freeze.
Indoor unit evap-
orator may
freeze.
Compressor
stops occasion-
ally.
Compressor does
not operate.
Heating
Cold air preven-
tion
Cold air preven-
tion deactivates
too soon and cold
air discharges.
Compressor
operates at low
speed or stops,
and frequency
does not
increase.
Cold air preven-
tion 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
