Caution For Pump Down; Self-Diagnosis Function Table And Contents Of Alarm Display - Panasonic U-72MF2U9 Service Manual

7. Caution for Pump Down

8. Self-Diagnosis Function Table and Contents of Alarm Display

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

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
1 LED 1 LED 2
Alternating
2
3
( : 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.
4
Self-Diagnosis Function Table
• Cause and countermeasure against the symptom of auto address failure
• When turning ON power to the outdoor main unit, LEDs 1
5
and 2 illuminate or blink excluding going out.
Auto address setting is not available.
• When auto address setting by the remote controller begins,
the alarm display appears immediately.
6
• When auto address setting by the remote controller begins,
no display appears.
• Auto address setting begins but finishes improperly.
7
• Soon after a few seconds or after a few minutes, the alarm
content is displayed on the remote controller.
• After a few minutes when auto address setting begins, the
compressor may occasionally start and stop several times.
8 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).
9
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.
Alarm display
After LED1 blinks M times, LED2 blinks N times.
This will be repeated.
Times of blinks
2
3
M 4
5
6
For example: After LED1 blinks twice, LED2 blinks 17 times. This will be repeated.
The alarm shows "P17".
Symptom
Symptom
Contents of Alarm Display
Type of alarm
P Alarm
H Alarm
N = Times of alarm No.
E Alarm
F Alarm
L Alarm
Cause and countermeasure
See "Contents of Alarm Display" and make corrections.
Are remote control wiring and inter-unit control wiring
connected properly?
Is indoor unit turned ON power?
Cause and countermeasure
See "Contents of Alarm Display" and make a correction.
Are remote control wiring and inter-unit control wiring
connected properly?
Is indoor unit turned ON power?
6 - 16
3WAY VRF SYSTEM
Test Run