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2WAY SYSTEM
Trouble Diagnosis
6
3. 2WAY 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
Outdoor unit capacity not set
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.
L17 Alarm
Alarm code
Alarm meaning
Alarm conditions
Probable cause
(2) The connected unit is correct, however the refrigerant type setting in the outdoor unit
(3) The setting of JP06 is different between the main unit and sub unit.
(3) Completely disconnect the JP06 of the main and sub units when making a renewal setting.
If using a standard style, leave it as it is.
EEPROM (item code 80) is incorrect.
Check
(2) Use the outdoor unit maintenance remote controller and check the item code 80 refrigerant
type. If the setting is incorrect, change it to R410A.
Correction
Example
Notes
L17
Outdoor unit model mismatch
This alarm occurs when a unit other than a R410A refrigerant model is connected.
(1) A unit that uses R407C refrigerant, or a R22 model unit, was connected by mistake.
(1) Check the refrigerant type at the connected unit.
—
—
The outdoor unit maintenance remote controller is required in order to set the refrigerant type 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 operation failure
During heating operation (Comp. ON), the highest detected temperature at an outdoor unit
heat exchanger (EXG 1, EXG 2, EXL 1, or EXL 2) was 20°C or more above the outdoor air
temperature (Air Temp.) 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 CN20) has become disconnected from the Outdoor Unit
Control PCB.
(1) Check the 4-way valve connector (20S CN20).
If the connector is normal, correct or replace the problem locations.
—
—
Alarm code
Alarm meaning
Alarm conditions
that unit 5 times or more within 3 minutes.
Probable cause
Check
Correction
Example
Notes
L04
Outdoor system address duplication
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).
SM830253-00_欧州2way7_SM-TRSM.indb 19 16/08/02 14:02:51
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