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[8] TROUBLESHOOTING GUIDE
1. Self-Diagnosis Function and Display Mode
To display self-diagnosis result, hold down the AUX button for more than 5 seconds when the indoor unit is not operating.
• The number of indications displayed by the LEDs on the outdoor unit differs from that for the 2001 cooling unit models (for
detailed display of malfunction information).
The display of malfunction No. differs from that of the 2001 cooling unit models. To show detailed malfunction information, two
types of numbers flash alternately. (example: "21" ← →"-0")
1) The content of the self-diagnosis memory can be called out and displayed on the seven-segment display section on the indoor
unit. (The error data cannot be called out for display by the LED on the outdoor unit.)
2) If the power cord is unplugged from the AC outlet or the circuit breaker is turned off, the self-diagnosis memory loses the stored
data.
a) (*1) The self-diagnosis display function of the indoor unit indicates the content of diagnosis by showing the error main
category (number) and the error sub-category (-number) alternately in 1-second intervals on the seven segment display
section of the indoor unit.
Example of self-diagnosis display on indoor unit: Compressor high-temperature error
b) (*2) The self-diagnosis display function of the outdoor unit indicates the error information by flashing LED1 on the outdoor
unit according to the content of self-diagnosis.
The self-diagnosis display function of the outdoor unit is active only for about 3 to 10 minutes after self-diagnosis is
performed during operation, and the display returns to normal condition after this display period.
The content of self-diagnosis cannot be called out by the self-diagnosis display function of the outdoor unit.
Example of self-diagnosis display on outdoor unit: Compressor high-temperature error
ON
OFF
c) (*3) The content of diagnosis is transferred to the indoor unit via serial communication, but it does not trigger a complete shutdown
operation
: Flashes in 2-sec. intervals (normal), :
flashes in 2-sec. intervals, the outdoor unit is in normal condition.)
Status of
Indication
indoor/
by LED1
outdoor
on
units
outdoor
unit *2
Indoor/
Normal
flashing
outdoor
units in
operation
Indoor/
1 time
outdoor
units in
complete
shutdown
12PHR-N_S530612PHRN.indd 13
1 sec 1 sec
0
5 .
s
c e
1 sec
0.5 sec
On, : Off,
Malfunction No.
displayed on main unit
display section
Main
Sub-
category
category
0
0
1
-0
-1
-2
-3
1 sec
1 sec
1 sec
0.5 sec 1 sec
: Flashes 3 times in 0.2-sec. intervals (When LED1 on the outdoor unit
Content of diagnosis
Main
Sub-category
category
Normal
Outdoor unit
Heat exchanger
thermistor
thermistor short-
short-circuit
circuit error
Outside
temperature
thermistor short-
circuit error
Suction thermistor
short-circuit error
2-way valve
thermistor short
circuit error
3-13
0
5 .
s
c e
1 sec 1 sec
Inspection
Remedy
location/method
–
–
(1) Measure resistance
(1) Replace the
of the outdoor unit
outdoor unit thermistor
thermistors. (TH2 to
assembly.
TH5: Approx. 4.4 kΩ
at 25°C)
(2) Check the lead
(2) Replace the
wire of the outdoor
outdoor unit thermistor
unit thermistor for torn
assembly.
sheath and short-
circuit.
(3) No abnormality
(3) Replace the
found in above
outdoor unit control
inspections (1) and (2).
PWB -3 2-way valve
ther- assembly.
12PHR-N
2013/8/7 15:42:17
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