Panasonic U-4LE1E5 Service Manual page 95

3. Mini VRF System Alarm Codes
E06 Error in the Outdoor Unit Receiving Signal from the Indoor Unit
(When indoor unit(s) are connected)
1. Error Detection Method
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 indoor unit is not turned on.
•
•
The DISP pin of the indoor unit is shorted.
•
There is a short, open, wrong contact or grounding of the indoor/outdoor operation line.
•
The signal output control PC board (optional control PC board) inside the indoor unit has failed.
•
The thermistor inside the indoor unit is grounded.
2. Error Diagnosis
1 Indoor unit
1-1 Is the indoor unit powered off?
power
2 Indoor/
outdoor
Is the indoor/outdoor operation line shorted, opened,
2-1
operation
grounded or has a wrong contact?
line
3 Indoor
Are the DISP pin and/or CHK pin on the indoor unit control PC board
3-1
units
short-circuited?
control
Is the wireless remote controller and/or optional control PC board
PC board
3-2
connected to on the indoor unit's control PC board?
Disconnect the connector mentioned above on the control PC board
of the indoor unit control PC board, and see whether the E06 goes off
3-3 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.)
3-4 Replace all optional control PC board and/or wireless remote control parts including wiring.
3-5 Indoor unit control PC board failure
•
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.
CHK Pin
OPTION
DC Motor Model Indoor unit Control PC Board
Replace board.
DISP Pin
RC
5 - 15
OPTION
CHK Pin
AC Motor Model Indoor unit Control PC Board
Mini VRF SYSTEM
Trouble Diagnosis
Yes Power on
No 2-1
Yes Correct the wiring
No 3-1
Yes Remove the short
No 3-2
Yes 3-3
No 3-5
Yes 3-4
No 3-5
DISP Pin RC
5