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12PHR-N
[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
1 sec 1 sec
1 sec
1 sec
1 sec
1 sec
c
e
s
5
.
0
c
e
s
5
.
0
0.5 sec
0.5 sec 1 sec
ON
OFF
1 sec 1 sec
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), : On, : Off, : Flashes 3 times in 0.2-sec. intervals (When LED1 on the outdoor unit
flashes in 2-sec. intervals, the outdoor unit is in normal condition.)
Status of
indoor/
outdoor
units
Indication
by LED1
on
outdoor
unit *2
Malfunction No.
displayed on main unit
display section
Content of diagnosis
Inspection
location/method
Remedy
Main
category
Sub-
category
Main
category
Sub-category
Indoor/
outdoor
units in
operation
Normal
flashing
0
0
Normal
–
–
Indoor/
outdoor
units in
complete
shutdown
1 time
1
-0
Outdoor unit
thermistor
short-circuit
Heat exchanger
thermistor short-
circuit error
(1) Measure resistance
of the outdoor unit
thermistors. (TH2 to
TH5: Approx. 4.4 kΩ
at 25°C)
(1) Replace the
outdoor unit thermistor
assembly.
-1
Outside
temperature
thermistor short-
circuit error
(2) Check the lead
wire of the outdoor
unit thermistor for torn
sheath and short-
circuit.
(2) Replace the
outdoor unit thermistor
assembly.
-2
Suction thermistor
short-circuit error
(3) No abnormality
found in above
inspections (1) and (2).
(3) Replace the
outdoor unit control
PWB -3 2-way valve
ther- assembly.
-3
2-way valve
thermistor short
circuit error
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Summary of Contents for 12PHR-N
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