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Model
U-4LE1E5 U-4LE1E8 U-5LE1E5 U-5LE1E8 U-6LE1E5 U-6LE1E8 S-15M S-22M S-28M S-36M S-45M S-60M S-73M S-90M S-106M S-140M S-160M
Pages
127
Size
7.63 MB
Type
PDF
Document
Service Manual
Brand
Device
Air Conditioner / MINI VRF SYSTEM
File
u-4le1e5-u-4le1e8-u-5le1e5-u-5le1e8-u-6le1e5-u-6le.pdf
Date
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Panasonic U-4LE1E5 / U-4LE1E8 / U-5LE1E5 / U-5LE1E8 / U-6LE1E5 / U-6LE1E8 / S-15M / S-22M / S-28M / S-36M / S-45M / S-60M / S-73M / S-90M / S-106M / S-140M / S-160M Service Manual ▷ View online

5 - 13
5
Mini VRF SYSTEM
Trouble Diagnosis
3. Mini VRF System Alarm Codes
The ‘/’ in the table indicates the DC motor’s indoor unit board/AC motor’s indoor unit board.
•
There is no TEST pin on the AC motor’s indoor unit board.
•
Regarding the remote controller check, refer to the Reference Materials.
•
For information on the procedures for replacing the nonvolatile memory (EEPROM) of the indoor unit and/or replacing the
indoor unit’s control board, refer to the manual that is packaged with the indoor unit service board.
•
DC Motor Model Indoor unit Control Board
AC Motor Model Indoor unit control Board
LED
LED
CHK Pin
TEST Pin
OPTION
OPTION
RC
RC
CHK Pin
(for single-phase outdoor unit PCB)
(for 3-phase outdoor unit PCB)
TERMINAL
TERMINAL
Regarding the PCB photos for individual indoor units, refer to the Section “PCB AND FUNCTIONS” in the 
TECHNICAL DATA.
NOTE
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5 - 14
5
Mini VRF SYSTEM
Trouble Diagnosis
3. Mini VRF System Alarm Codes
E05 Error in Indoor Unit Transmitting Signal to the Outdoor Unit
Error Detection Method
Error Diagnosis
It is judged an error when a unit itself cannot receive a signal that it has sent.
Indoor unit control PC board error
The setting of the terminal resistor select switch on the outdoor unit main PC board is set incorrectly.
•
•
For information on the procedures for replacing the indoor unit’s control PC board, refer to the manual that is packaged with
the indoor unit service board.
•
1.
2.
Is the terminal resistor select switch on the outdoor main PC board 
set to OPEN?
Is the indoor/outdoor operation line opened or shorted?
1-3
1-4
Replace the indoor unit control PC board.
1-5
Is the indoor/outdoor operation line connected to more than one 
outdoor unit? (Network wired?)
1-1
Is the SHORT on the terminal resistor select switch on the outdoor 
main PC board set to one unit, and the others are OPEN?
1-2
 
Make the SHORT
setting
1-4
Yes
No
1-2
1-3
Yes
No
1-4
Set the SHORT to
one unit only
Yes
No
1 Indoor
unit
control
PC board
Correct the wiring
1-5
Yes
No
(for single-phase outdoor unit PC board)
(for 3-phase outdoor unit PC board)
TERMINAL
TERMINAL
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5 - 15
5
Mini VRF SYSTEM
Trouble Diagnosis
3. Mini VRF System Alarm Codes
E06 Error in the Outdoor Unit Receiving Signal from the Indoor Unit
Error Detection Method
(When indoor unit(s) are connected)
Error Diagnosis
It is judged an error when there is no transmission (reply) from the indoor unit to the outdoor unit for a period of three minutes.
The ‘/’ in the table indicates the DC motor’s indoor unit board/AC motor’s indoor unit board.
•
There is no TEST pin on the AC motor’s indoor unit board.
•
For information on the procedures for replacing the indoor unit’s control board, refer to the manual that is packaged with
the indoor unit control PCB.
•
1.
2.
3
Remove the short
3-2
Are the DISP pin and/or CHK pin on the indoor unit control PC board 
short-circuited?
Is the indoor unit powered off?
1-1
Is the indoor/outdoor operation line shorted, opened, 
grounded or has a wrong contact? 
2-1
3-1
Is the wireless remote controller and/or optional control PC board 
connected to on the indoor unit’s control PC board?
3-2
Power on
2-1
Correct the wiring
3-1
 
 
3-3
3-5
Yes
Yes
Yes
No
No
No
Disconnect the connector mentioned above on the control PC board
of the indoor unit control PC board, and see whether the E06 goes off
after several minutes. (When doing so, if two remote controllers are 
being used and the wireless remote controller is the main remote 
controller, set the other remote controller as the main.)
3-3
Replace all optional control PC board and/or wireless remote control parts including wiring.
3-4
3-5
3-4
3-5
Yes
No
Indoor 
units
control 
PC board
1 Indoor unit
power
2 Indoor/
outdoor 
operation 
line
Yes
No
The indoor unit is not turned on.
The DISP pin of the indoor unit is shorted.
The signal output control PC board (optional control PC board) inside the indoor unit has failed.
•
•
•
There is a short, open, wrong contact or grounding of the indoor/outdoor operation line.
•
The thermistor inside the indoor unit is grounded.
•
Indoor unit control PC board failure
Replace board.
RC
OPTION    
OPTION
CHK Pin
CHK Pin
DC Motor Model Indoor unit Control PC Board
AC Motor Model Indoor unit Control PC Board
DISP Pin
RC
DISP Pin
Regarding the PCB photos for individual indoor units, refer to the Section “PCB AND FUNCTIONS” in the 
TECHNICAL DATA.
NOTE
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5 - 16
5
Mini VRF SYSTEM
Trouble Diagnosis
3. Mini VRF System Alarm Codes
E07 Error in Outdoor Unit Transmitting Signal to the Indoor Unit
Error Detection Method
Error Diagnosis
It is judged an error when a unit itself cannot receive (discrepancy) a signal within a 3-minute period that it had sent.
Outdoor main PC board error
The setting of the terminal resistor select switch on the outdoor main PC board is set incorrectly.
•
•
For information on the procedures for replacing the outdoor main PC board, refer to the manual that is packaged with the
service board.
•
1.
2.
Is the terminal resistor select switch on the outdoor main PC board 
set to OPEN?
Is the indoor/outdoor operation line opened or shorted?
1-3
1-4
Replace the outdoor unit main PC board.
1-5
Is the indoor/outdoor operation line connected to more than one 
outdoor unit? (Network wired?)
1-1
Is the SHORT on the terminal resistor switch on the outdoor main 
PC board set to one unit, and the others are OPEN?
1-2
 
Make the SHORT
setting
1-4
Yes
No
1-2
1-3
Yes
No
1-4
Set the SHORT to
one unit only
Yes
No
1 Outdoor
unit
control
PC board
Correct the wiring
1-5
Yes
No
(for single-phase outdoor unit PC board)
(for 3-phase outdoor unit PC board)
TERMINAL
TERMINAL
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