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1. 2WAY VRF DCI Alarm Codes
H31 Alarm
Alarm code
Alarm meaning
Alarm conditions
Probable cause
Check
Correction
Example
Notes
L04 Alarm
Alarm code
Alarm meaning
Alarm conditions
Probable cause
Check
Correction
Example
Notes
L05 Alarm
Alarm code
Alarm meaning
Alarm conditions
Probable cause
7
Check
Correction
Example
Notes
H31
HIC trouble alarm
This alarm occurs when the microcomputer identifies a trouble signal (indicating abnormal HIC
temperature or other trouble) from the HIC.
The HIC judges the current and temperature, and outputs the trouble signal. In general this
indicates trouble with the HIC itself.
Overcurrent in HIC circuit, and resultant abnormal heating, caused by HIC failure
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.
HIC –
If an HIC failure is found, replace the PCB.
—
Turn OFF the power, and check the continuity of HIC+ and HIC– on the HIC PCB.
L04
Outdoor unit refrigerant system address duplication
Communication by inter-unit control wiring was received that contained the same address as that
unit 5 times or more within 3 minutes.
Incorrect outdoor system address settings
Check the system address settings again.
Correct the system address settings.
—
Recovery from this alarm occurs automatically (when communication that contains the same
address as that unit is not received for 3 minutes after detection).
L05
Duplicated indoor unit priority (alarm at priority indoor units)
Multiple indoor units set as the priority unit were detected.
More than one indoor unit is set as the priority unit.
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."
If the value of indoor unit EEPROM item code 04 is incorrect, set the correct value from the
wired remote controller.
—
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.
HIC PCB
7 - 13
2-WAY MULTISET VRF SYSTEM
Trouble Diagnosis
HIC +
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