Mini VRF SYSTEM
Test Run
7 - 22
7
7. Self-Diagnosis Function Table and Contents of Alarm Display
• Auto address setting begins but finishes improperly.
Symptom Cause and countermeasure
• Soon after a few seconds or after a few minutes, the alarm
content is displayed on the remote controller.
See “Contents of Alarm Display” and make a correction.
• After a few minutes when auto address setting begins, the
compressor may occasionally start and stop several times. LEDs
1 and 2 on outdoor unit control PCB show the display of auto
address setting with blinking alternately but LEDs 1 and 2 do not
indicate the completion of auto address setting (go out).
Are remote control wiring and inter-unit control wiring
connected properly?
Is indoor unit turned on power?
• If the alarm display “E15”, “E16” and “E20” appear after auto address setting began, check the following items.
Alarm display Alarm contents
E15
Recognized number of indoor units at the time of auto address setting are fewer than that of indoor
units set by SW3 and SW4 on outdoor unit control PCB (Main).
E16
Recognized number of indoor units at the time of auto address setting are more than that of indoor units
set by SW3 and SW4 on outdoor unit control PCB (Main).
E20
Outdoor unit could not entirely receive serial communication signal from the indoor unit within 90
seconds after auto address setting began.
Check E15 E16 E20
Have you forgotten to turn on power to indoor unit?
Are indoor and outdoor control wiring connected properly?
(Check for incorrect wiring to open & short-circuit, terminal pin and remote control terminal.)
Are the number of the connecting indoor units set by SW3 and SW4 of outdoor unit control PCB
(Main) connected properly?
Is additional appropriate amount of refrigerant charge?
(Compressor ON at the time of auto address setting)
Is the refrigerant tubing connected properly?
(Compressor ON at the time of auto address setting)
Are E1 and E3 sensors of indoor unit normal?
(Compressor ON at the time of auto address setting)
Are there any wrong system address installed in indoor units caused by manual or incorrect auto
address control?
1) When auto address setting from outdoor unit control PCB (Main) or remote controller begins, “Under Setting”
appears on the remote controller as for normal indoor units under the inter-unit control wirings and remote
control wirings.
LEDs 1 and 2 indicators on outdoor unit control PCB (Main) blink alternately.
2) If there is an error at the inter-unit control wiring of the remote controller when in the indoor unit group control,
address setting may not occasionally be made although “under setting” is displayed.
3) Although the alarm “E15” and “E16” are displayed, addresses will be installed in the recognized indoor units.
The installed addresses can be checked by the remote controller. See “Checking the indoor unit addresses”.
• When operating the remote controller after auto address setting completed (LEDs 1 and 2 indicators on outdoor
unit control PCB (Main) go out), correct the symptom if the following alarms appear on the remote controller.
Remote control display
Cause
No display
Remote controller is not connected properly. (Power failure)
When auto address setting was completed, the power of indoor unit was turned o.
E01
Remote controller is not connected properly. (Receiving failure from remote control)
Indoor unit address was mistakenly controlled by undesired indoor unit remote controller.
(Impossible to communicate with outdoor unit)
E02
Remote controller is not connected properly.
(Impossible to communicate with indoor unit by remote controller)
P09 Connector of indoor unit ceiling panel is not connected properly.
If any other alarm appears on the display, see Section 6.
SM830289-01_欧州向け R32 mini VRF 8,10HP SM&TRSM.indb 22SM830289-01_欧州向け R32 mini VRF 8,10HP SM&TRSM.indb 22 2021/05/07 10:16:522021/05/07 10:16:52
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