2WAY VRF SYSTEM
Test Run
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8. Self-Diagnosis Function Table and Contents of Alarm Display
How to know LEDs 1 and 2 alarm display on outdoor unit control P.C. board
LED 1
LED 2
Contents of Alarm Display
Alarm display
After LED1 blinks M times, LED2 blinks N times.
This will be repeated.
Times of blinks
Type of alarm
N = Times of alarm No.
M
2
P Alarm
3
H Alarm
4
E Alarm
5
F Alarm
6
L Alarm
For example: After LED1 blinks twice, LED2 blinks 17 times. This will be repeated.
The alarm shows “P17”.
Alternating
( : Blink)
Connect the outdoor unit maintenance remote controller to the RC plug (3P, BLU) on outdoor main unit control
P.C. board and make confirmation.
Self-Diagnosis Function Table
•
Cause and countermeasure against the symptom of auto address failure
Symptom
Cause and countermeasure
•
When turning ON power to the outdoor main unit, LEDs 1
and 2 illuminate or blink excluding going out.
Auto address setting is not available.
See “Contents of Alarm Display” and make corrections.
•
When auto address setting by the remote controller begins,
the alarm display appears immediately.
•
When auto address setting by the remote controller begins,
no display appears.
Are remote control wiring and inter-unit control wiring
connected properly?
Is indoor unit turned ON power?
•
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 P.C. board 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?
7. Caution for Pump Down
Pump down means refrigerant gas in the system is returned to the outdoor unit.
Pump down is used when the unit is to be moved, or before servicing the refrigerant circuit.
See the section 2.
CAUTION
This outdoor unit cannot collect more than the rated refrigerant amount as shown by the
nameplate on the back.
If the amount of refrigerant is more than that recommended, do not conduct pump down.
In this case use another refrigerant collecting system.
7. Caution for Pump Down
8. Self-Diagnosis Function Table and Contents of Alarm Display
• 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 main unit
P.C.
board.
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 main unit
P.C.
board.
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?
Is remote control wiring connected properly? (Check
f
or open & short-circuit, wrong connection
to indoor/outdoor unit control wiring terminal, inter-unit control wiring.
)
Are the number of the connecting indoor units set by SW3 and SW4 of outdoor main unit control
P.C.
board 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 main unit control
P.C.
board 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 main unit control
P.C.
board 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 chec
k
ed by the remote controller. See the section “Checking the indoor unit address”.
• When operating the remote controller after auto address setting completed (LEDs 1 and 2 indicators on outdoor main unit control
P.C.
board 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.
(P
ower failure)
When auto address setting was completed, the power of indoor unit was turned off
.
E01
Indoor unit does not respond to remote controller.
Indoor unit address was mistakenly controlled by undesired indoor unit remote controller.
(Impossible to communicate with outdoor unit)
E02
The remote controller is having error in sending serial communication signal
.
(Impossible to communicate with indoor unit by remote controller)
P09
Connection to the panel of indoor unit is not good.
If any other alarm appear on the display, see the section 5.
• Alarm display can be chec
k
ed by the outdoor maintenance remote controller. When operating, see the section 5.
Alarm display can also be chec
k
ed by number of blinking of LEDs 1 and 2 on outdoor unit control
P.C.
board.
See the section “How to know LEDs 1 and 2 alarm display on outdoor unit control
P.C.
board” under the section “8. Self-
Diagnosis Function Table and Contents of Alarm Display”.
Remote control display
Alarm contents
E01
Indoor unit does not respond to remote controller.
E02
The remote controller is having error in sending serial communication signal
.
E03
Controller does not respond to indoor unit.
E04
Oudoor unit does not respond to indoor unit.
E06
Some indoor units does not respond to outdoor unit.
E08
Indoor unit address is dupulicating.
(Check for incorrect wiring to open & short-circuit, terminating resistance pin and remote control
terminal.)
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