3-6
Trouble Diagnosis
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E06 alarm
Alarm code E06
Alarm meaning Outdoor unit failed to receive serial communication signals from indoor unit.
Outdoor unit failed to receive serial communication signals from indoor unit.
Alarm conditions
Probable cause (1) The indoor unit power was cut OFF after initial communications were completed.
(2) An open circuit or short circuit occurred in the inter-unit control wiring after initial
communications were completed.
Check Check the power at the indoor and outdoor units, and check the inter-unit control wiring.
Correction
Example
Notes This alarm is detected after initial communications are completed. Therefore, it does not occur in
cases of “disconnected serial connector,” “no terminal unit set,” or other trouble that occurs
before initial communications are completed. If initial communications have not been completed,
alarm E04 occurs.
E15 Alarm
Alarm code E15
Alarm meaning Automatic address setting alarm (too few units)
Alarm conditions The number of indoor units was too few when automatic address setting was performed.
Probable cause (1) The number of indoor units set at the indoor unit quantity setting SW (No. of I/U: S004, S005)
on the outdoor unit PCB is too many.
(2) The inter-unit control wiring between indoor units has been cut.
Check (1) Refer to the test run servicing materials and check the indoor unit quantity setting SW (No. of
I/U: S004, S005).
(2) Check the inter-unit control wiring at the indoor and outdoor units.
Correction After correcting the indoor unit quantity setting or the inter-unit control wiring, perform automatic
address setting again.
Example
Notes W-2WAY ECO-i switch position
—
—
—
Automatic address setting start is prohibited.
Automatic address setting was started when automatic address setting was in progress at
another outdoor unit in the same link.
Automatic address setting is in progress at another outdoor unit.
This alarm is not displayed on the remote controller. Therefore check the blinking
on the outdoor unit PCB.
Wait for automatic address setting to be completed at the outdoor unit where it is currently in
progress. Then start automatic address setting again.
E12 Alarm
Alarm code E12
Alarm meaning
Alarm conditions
Probable cause
Check
Correction
Example
Notes
E06 Alarm
3. W-2WAY ECO-i Alarm Codes