6 - 10
2WAY SYSTEM
Trouble Diagnosis
6
Alarm code
Alarm meaning
Alarm conditions
Probable cause
(2) An open circuit or short-circuit occurred in the inter-unit control wiring after initial
communications were completed.
Check
Correction
Example
Notes
E06
Outdoor unit failed to receive serial communication signals from indoor unit.
Outdoor unit failed to receive serial communication signals from indoor unit.
(1) The indoor unit power was cut OFF after initial communications were completed.
Check the power at the indoor and outdoor units, and check the inter-unit control wiring.
—
—
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.
E12 Alarm
Alarm code
Alarm meaning
Alarm conditions
another outdoor unit in the same link.
Probable cause
Check
unit PCB.
Correction
progress. Then start automatic address setting again.
Example
Notes
E12
Automatic address setting start is prohibited.
Automatic address setting was started when automatic address setting was in progress at
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
Wait for automatic address setting to be completed at the outdoor unit where it is currently in
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—
E15 Alarm
Alarm code
Alarm meaning
Alarm conditions
Probable cause The number of indoor units set at the indoor unit quantity setting SW (SW3, SW4) on the
outdoor unit PCB is too many.
(2)
Check (1) Refer to the test run servicing materials and check the indoor unit quantity setting SW (SW3,
SW4).
(2)
The inter-unit control wiring between indoor units has been cut.
Check the inter-unit control wiring at the indoor and outdoor units.
Correction
address setting again.
Example
Notes
E15
Automatic address setting alarm (too few units)
The number of indoor units was too few when automatic address setting was performed.
(1)
After correcting the indoor unit quantity setting or the inter-unit control wiring, perform automatic
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2WAY switch position
SW3
SW4
SM830204-05_2WAY SYS.indb 10 2015/01/20 17:45:18
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