AYXP12JHRN
3 – 1
AYXP12JHRN
Service Manual
CHAPTER 3. FUNCTION AND OPERATION OF PROTECTIVE PROCEDURES
[1] PROTECTION DEVICE FUNCTIONS AND OPERATIONS
Function Operation Self-diagnosis
result display
Description Detection period Reset condition Indoor
unit
error
display
Indoor
unit
Outdoor
unit
1 Indoor unit fan lock Operation stops if there is no
input of rotation pulse signal from
indoor unit fan motor for 1 minute.
When indoor unit fan
is in operation
Operation OFF or ON ✩2 Yes None
Indoor unit fan rota-
tion speed error
Operation stops if rotation pulse
signal from indoor unit fan indi-
cates abnormally low speed
(about 300 rpm or slower).
When indoor unit fan
is in operation
Operation OFF or ON ✩2 Yes None
2 Indoor unit freeze
prevention
Compressor stops if temperature
remains below 0°C for 4 minutes.
When in cooling or
dehumidifying opera-
tion
Automatic reset when
heat exchanger tem-
perature rises above
freeze prevention
temperature (2°C or
higher)
— None None
3 2-way valve freeze
prevention
Compressor stops if temperature
of outdoor unit 2-way valve
remains below 0°C for 10 continu-
ous minutes during cooling or
dehumidifying operation.
When in cooling or
dehumidifying opera-
tion
Automatic reset when
temperature of 2-way
valve rises above
10°C.
None Yes Yes
4 Indoor unit heat
exchanger over-
heat shutdown
Operating frequency lowers if
indoor unit heat exchanger tem-
perature exceeds overheat tem-
perature during heating
operation.
Compressor stops if indoor unit
heat exchanger temperature
exceeds overheat temperature for
60 seconds at minimum fre-
quency.
Overheat temperature setting
value indoor unit heat exchanger
thermistor temperature: about 45
to 54°C
When in heating
operation
Automatic reset after
safety period (180
sec).
None Yes Yes
5 Outdoor unit heat
exchanger over-
heat shutdown
Operation frequency lowers if out-
door unit heat exchanger temper-
ature exceeds about 55°C during
cooling operation.
Compressor stops if outdoor unit
heat exchanger temperature
exceeds about 55°C for 120 sec-
onds at minimum frequency.
When in cooling or
dehumidifying opera-
tion
Automatic reset after
safety period (180
sec).
None Yes Yes
6 Compressor dis-
charge overheat
shutdown
Operating frequency lowers if
temperature of compressor
chamber thermistor (TH1) falls
below about 110°C.
Compressor stops if temperature
of compressor chamber ther-
mistor (TH1) remains at about
110°C (for 120 seconds in cooling
operation, or 60 seconds in heat-
ing operation) at minimum fre-
quency.
When compressor is
in operation
Automatic reset after
safety period (180
sec).
None Yes Yes
7 Dehumidifying oper-
ation temporary
stop
Compressor stops if outside air
temperature thermistor is lower
than about 16°C during dehumidi-
fying operation.
When in dehumidify-
ing operation
Automatic reset when
outside air tempera-
ture rises above
16°C.
None Yes Yes
8 DC overcurrent
error
Compressor stops if DC current
of about 25 A or higher flows in
IPM.
When compressor is
in operation
Operation OFF or ON Yes ✩1Yes Yes
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