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4. W-2WAY ECO-i Alarm Codes
W-2WAY ECO-i SYSTEM
Trouble Diagnosis
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
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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).
L10 Alarm
Alarm code
L10
Alarm meaning
Outdoor unit capacity not set
Alarm conditions
The outdoor unit capacity has not been set, or the setting is not allowed by the system.
Probable cause
This alarm occurs because the capacity has not been set.
Check
Connect the outdoor unit maintenance remote controller. On the outdoor unit EEPROM detailed
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
If item code 81 is incorrect, use the outdoor unit maintenance remote controller and set it
correctly.
* After changing the setting, be sure to reset both the indoor and outdoor power.
Example
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Notes
The outdoor unit maintenance remote controller is required in order to set the capacity in the
outdoor unit EEPROM.
L17 Alarm
Alarm code
L17
Alarm meaning
Outdoor unit model mismatch
Alarm conditions
This alarm occurs when a unit other than a R410A refrigerant model is connected.
Probable cause
(1) A unit that uses R407C refrigerant, or a R22 model unit, was connected by mistake.
(2) The connected unit is correct, however the refrigerant type setting in the outdoor unit
EEPROM (item code 80) is incorrect.
Check
(1) Check the refrigerant type at the connected unit.
(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
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Notes
The outdoor unit maintenance remote controller is required in order to set the refrigerant type in
the outdoor unit EEPROM.
L18 Alarm
Alarm code
L18
Alarm meaning
4-way valve operation failure
Alarm conditions
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 40°F or more above the outdoor air
temperature (Air Temp.) continuously for 5 minutes or longer, or the detected suction temperature
(SCT) was 40°F or more above the outdoor air temperature continuously for 5 minutes or longer.
Probable cause
(1) The 4-way valve connector (20S CN060) has become disconnected from the control PCB.
(2) The 4-way valve circuit is locked (malfunctioning).
Check
(1) Check the 4-way valve connector (20S CN060).
(2) If the connector is normal, check the 4-way valve wiring and the PCB circuit.
Correction
If the connector is normal, correct or replace the problem locations.
Example
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Notes
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Summary of Contents for AHX0752
Page 39: ... MEMO 1 34 ...
Page 77: ... MEMO 2 38 ...
Page 91: ... MEMO 3 14 ...
Page 141: ... MEMO 5 32 ...
