Panasonic WU-144MF1U9E 3-Way Service Manual - Page 125

E06 Alarm, Alarm code, progress. Then start automatic address setting again.

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4. 3-WAY VRF Alarm Codes 3-WAY VRF SYSTEM Trouble Diagnosis E06 Alarm Alarm code Alarm meaning Alarm conditions Probable cause 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. (2) An open circuit or short circuit occurred in the inter-unit control wiring 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 Probable cause Check Correction Example Notes E12 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. - - 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 (S004, S005) on the outdoor unit PCB is too many. Check (2) The inter-unit control wiring between indoor units has been cut. (1) Refer to the test run servicing materials and check the indoor unit quantity setting SW (S004, 5 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 3-WAY VRF switch position S004 S005 5 - 9

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E06 Alarm
Alarm code
E06
Alarm meaning
Outdoor unit failed to receive serial communication signals from indoor unit.
Alarm conditions
Outdoor unit failed to receive serial communication signals from indoor unit.
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.
E12 Alarm
Alarm code
E12
Alarm meaning
Automatic address setting start is prohibited.
Alarm conditions
Automatic address setting was started when automatic address setting was in progress at
another outdoor unit in the same link.
Probable cause
Automatic address setting is in progress at another outdoor unit.
Check
This alarm is not displayed on the remote controller. Therefore check the blinking on the outdoor
unit PCB.
Correction
Wait for automatic address setting to be completed at the outdoor unit where it is currently in
progress. Then start automatic address setting again.
Example
—
Notes
—
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 (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 (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
3-WAY VRF switch position
S004
S005
5
5
- 9
3-WAY VRF SYSTEM
Trouble Diagnosis
4. 3-WAY VRF Alarm Codes