3-16
Trouble Diagnosis
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2
3
4
5
6
7
8
31
arm
Alarm code H31
Alarm meaning HIC trouble alarm
Alarm conditions This alarm occurs when the microcomputer identifies a trouble signal (indicating abnormal HIC
temperature or other trouble) from the HIC.
Probable cause Overcurrent in HIC circuit, and resultant abnormal heating, caused by HIC failure
Check Check the power wiring and connector wiring. If the wiring and connectors are normal, use a
tester to measure the resistance between the compressor HIC power (HIC+) and ground (HIC–).
If there is a short circuit, there is an HIC malfunction.
Correction If an HIC failure is found, replace the PCB.
Example
Notes Turn OFF the power, and check the continuity of HIC+ and HIC– on the HIC PCB.
L04 Alarm
Alarm code L04
Alarm meaning Outdoor unit refrigerant system address duplication
Alarm conditions Communication by inter-unit control wiring was received that contained the same address as that
unit 5 times or more within 3 minutes.
Probable cause Incorrect outdoor system address settings
Check Check the system address settings again.
Correction Correct the system address settings.
Example
Notes Recovery from this alarm occurs automatically (when communication that contains the same
address as that unit is not received for 3 minutes after detection).
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The HIC judges the current and temperature, and outputs the trouble signal. In general this
indicates trouble with the HIC itself.
L05 Alarm
Alarm code L05
Alarm meaning Duplicated indoor unit priority (alarm at priority indoor units)
Alarm conditions Multiple indoor units set as the priority unit were detected.
Probable cause More than one indoor unit is set as the priority unit.
Check From the wired remote controller, use the indoor unit EEPROM simple settings mode and
check whether or not the value for item code 04 is “0001.”
Correction If the value of indoor unit EEPROM item code 04 is incorrect, set the correct value from the
wired remote controller.
Example
Notes
This alarm is displayed at the indoor units which are set as the priority unit. At indoor units which
are not set as the priority unit, alarm L06 is displayed.
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3. W-2WAY ECO-i Alarm Codes
HIC
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HIC PCB
HIC
+
