Panasonic U-36LE1U6 Service Manual page 35

4. Mini VRF Alarm Codes
H31 alarm
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 The HIC judges the current and temperature, and outputs the trouble signal. In general this
indicates trouble with the HIC itself.
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
Turn OFF the power, and check the conductivity of HIC+ and HIC– on the HIC PCB.
Notes
L04 alarm
Alarm code L04
Alarm meaning
Outdoor 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
Recovery from this alarm occurs automatically (when communication that contains the same
Notes
address as that unit is not received for 3 minutes after detection).
HIC–
HIC PCB
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Trouble Diagnosis
HIC+
3