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Mini VRF SYSTEM
Trouble Diagnosis
6
3. Mini VRF Alarm Codes
L10 Alarm
Alarm code
Alarm meaning
Alarm conditions
Probable cause
Check
setting mode screen, check the value for the outdoor unit capacity (item code 81).
Check that it is not set to “0” or to a capacity that is not allowed.
Correction
correctly.
* After changing the setting, be sure to reset both the indoor and outdoor power.
Example
Notes
L10
Capacity setting of outdoor unit is not correct.
The outdoor unit capacity has not been set, or the setting is not allowed by the system.
This alarm occurs because the capacity has not been set.
Connect the outdoor unit maintenance remote controller. On the outdoor unit EEPROM detailed
If item code 81 is incorrect, use the outdoor unit maintenance remote controller and set it
—
The outdoor unit maintenance remote controller is required in order to set the capacity in the
outdoor unit EEPROM.
L18 Alarm
Alarm code
Alarm meaning
Alarm conditions
Probable cause
(2) The 4-way valve circuit is locked (malfunctioning).
Check
(2) If the connector is normal, check the 4-way valve wiring and the Outdoor Unit Control PCB
circuit.
Correction
Example
Notes
L18
4-way valve has failure.
During heating operation, the detected temperature at an outdoor unit heat exchanger (EXL) was
20°C or more above the outdoor air temperature (TO) continuously for 15 minutes or longer, or
the detected suction temperature (SCT) was 20°C or more above the outdoor air temperature
continuously for 5 minutes or longer.
(1) The 4-way valve connector (20S) has become disconnected from the Outdoor Unit Control
PCB.
(1) Check the 4-way valve connector (20S).
If the connector is normal, correct or replace the problem locations.
—
—
L04 Alarm
Alarm code
Alarm meaning
Alarm conditions
that unit 5 times or more within 3 minutes.
Probable cause
Check
Correction
Example
Notes
L04
Duplicate system address setting on outdoor units.
Communication by inter-unit control wiring was received that contained the same address as
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).
P03 Alarm
2WAY SYSTEM
Trouble Diagnosis
4. 2WAY Alarm Codes
Alarm code
P03
Alarm meaning
Compressor discharge temperature is too high.
Alarm conditions
Compressor : Pre-trip stops when the temperature exceeds 106°C.
* The alarm occurs when pre-trip stop occurs more than once. However, the pre-trip counter is cleared
if the compressor operates continuously for a specified length of time (more than 2.5 minuites).
Probable cause
(1)
(7) Electrical noise
Insufficient amount of refrigerant
(including trouble resulting from an insufficient initial charge and from gas leakage)
(2) Blocking of low-pressure parts caused by intrusion of foreign objects (moisture, scale, etc.)
(3) Malfunction of expansion valves (MOV1)
(4) Compressor discharge sensor failure
(5) Outdoor Unit Control PCB failure
(6) Failure to open the service valve of the outdoor unit
Check
Check:
(1) Insufficient refrigerant
Trouble: Liquid effectiveness is poor.
Check whether or not the superheating temperature is declining if the expansion valves
(MOV1) are opened to 300 pulses or more (after checking for foreign object intrusion).
Check:
(2) Sensor failure
This alarm is likely to occur when wiring is partially cut. (It is difficult to identify, even
when continuity is checked.) The detected discharge temperature is high.
•
•
Replace the sensor with another discharge sensor and compare the temperature conditions.
(3) Failure to open the service valve of the outdoor unit
Check open/closed status of the outdoor unit service valve.
(4) If the cause is still unknown after checking the above, there is possibility that electrical noise is the
cause of the trouble.
Correction
(1) Replace the sensor.
(2) Replace the Outdoor Unit Control PCB.
(3) Correct the problem locations.
Example
All of the probable causes
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