No.
1
Function Name
Self-diagnosis indication function
<Indicating a failure on the indoor
unit side>
<Indicating a failure on the outdoor
unit side>
Description
• The “timer lamp” indicates a mode of failure detected
on the indoor or outdoor unit side by blinking
frequency.
frequency
frequency
• A failure detected on the outdoor unit side will be
indicated by the “timer lamp” b
“timer lamp”
“timer lamp” linking 4 times after a
retry operation has been performed several times.
Note: In some failure modes, only the retry operation is
repeated without lamp indication.
<Failure modes that will repeat a retry operation without
the indoor unit lamp indication are as follows:>
OH thermistor temperature rise
Outdoor unit communication error
Power voltage abno
wer v
wer v
rmal
Less frequent defects
• The “LD301” indicates a mode of failure detected on
the outdoor unit side by blinking frequency.
linking frequency
linking frequency
Upon failure detection, the outdoor unit will shut down
and the LD301 continues to blink until the unit is reset.
(In the event of communication errors, the LD301
continues to blink until communication is restored.)
THE SUPPORT FUNCTION OF FAILURE DIAGNOSIS
No.
Blinking of Timer lamp
Reason for indication
Possible cause
Reversing valve defective
When the indoor heat exchanger
temperature is too low in the
heating mode or it is too high in the
cooling mode.
Outdoor unit is under forced
operation
Outdoor unit electrical components
defetive
When the outdoor unit is in forced
operation or balancing operation
after forced operation
Indoor/outdoor interface defective
When the interface signal from the
outdoor
When the same error mode is detected
8 times within 30 minutes from outdoor
unit electrical components.
(However, when error is detected 8
times within two hours only for outdoor
thermistor.)
unit is interrupted.
Room thermistor or heat exchanger
thermistor is faulty
When room thermistor or heat
exchanger thermistor is opened
circuit or short circuit.
Over-current detection at the DC fan
motor
when over-current is detected at the
DC fan motor of the indoor unit.
IC401 or IC402 data reading error
When data read from IC401 or
IC402 is incorrect.
(1) Reversing valve defective
(2) Heat exchanger thermistor
disconnected
(only in the heating mode)
(Note)
The malfunction mode is entered the
3rd time this abnormal indication
appears (read every 3 minutes).
Electrical parts in the outdoor unit
(1) Indoor interface circuit
(2) Outdoor
Outdoor unit electrical components
(For details, operate again using
remote comtroller and check from
self-diagnosis display of outdoor
unit.)
interface circuit
(1) Room thermistor
(2) Heat exchanger thermistor
(1) Indoor fan locked
(2) Indoor fan motor
IC401 or IC402 abnormal
<Cautions>
(1) If the interface circuit is faulty when power is supplied, the self-diagnosis display will not be displayed.
(2) If the indoor unit does not operate at all, check if the connecting cable is connected to the outdoor unit.
(3) To check operation again when the timer lamp is blinking, you can use the remote control for operation
(except for mode mark 1).
1
2
3
4
5
6
7
(
Lights for 0.35 sec. at interval of 0.35 sec.)
10 times
3 times
1 time
2 times
13 times
2sec.
2sec.
2sec.
2sec.
2sec.
1
9 times
2sec.
(3) Indoor control P.W.B.
4 times
2sec.
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