Panasonic U-4LE1E5 Service Manual page 98

4. Mini VRF System Alarm Codes
3. Mini VRF System Alarm Codes
E03 Error in Indoor Unit Receiving Signal from Remote Controller (central)
(When indoor unit(s) are connected)
1. Error Detection Method
It is judged an error when there is no communication from any remote controller (collectively) in a 3-minute period or if there
is no communication from the central device in a 15-minute period.
When there was once communication, but during use the remote control wiring is opened or miswired.
•
•
The line to the central control unit for indoor/outdoor operations is opened.
•
Settings are made only for sub remote controller.
•
The power to the central control unit is not on and remote controllers are not being used (or the indoor/outdoor operations
line to the central control unit is opened).
• When remote controller are not being used, only the sub remote controller is set up.
2. Error Diagnosis
1 Central
1-1
control unit
1-2
1-3
1-4
1-5
2 Remote
2-1
controller
2-2
3 Indoor
3-1
unit
5
control
PC board
3-2
3-3
3-4
•
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.
ON Side
ON
OFF Side
1 2 3 4
1
Central Control Main/Sub Switch
Main: OFF Side
Sub: ON Side
Intelligent Controller
Is the central control unit connected?
Is the central control unit's powered off?
Are all the Main/Sub switches on the connected central control unit
set to Sub?
Of the central control units that are connected, set only the uppermost central control unit to
Main and the others to Sub. The order from top to bottom is intelligent controller
system controller ON/OFF controller.
Is the indoor/outdoor operations line connected to the central
control unit opened?
Is the indoor unit under group control?
Are the wires 1 (white) & 2 (black) to the remote control group
opened, have wrong contact or grounded?
Is the wireless remote controller and/or optional control PC board
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 E03 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.)
Replace all optional control PC board and/or wireless remote control parts including wiring.
Is there a short, miswiring, open, wrong contact or grounding
in the remote control's wiring?
ON Side
ON
OFF Side
1
Central Control Main/Sub Switch
SW1
2 3 4 5 6 7 8
7
Main: OFF Side
Sub: ON Side
System Controller
5 - 11
5 - 10
Mini VRF SYSTEM
Mini VRF SYSTEM
Trouble Diagnosis
Trouble Diagnosis
Yes 1-2
No 2-1
Yes Power on
1-3
No
Yes 1-4
No 1-5
Yes Correct the setting
No 2-1
2-2
Yes
3-1
No
Yes Correct the setting
No 3-1
Yes 3-2
No 3-4
Yes 3-3
No 3-4
Yes Correct the wiring
Replace the indoor
No
unit control board
ON Side
ON
OFF Side
1 2 3 4 5 6 7
4
Central Control Main/Sub Switch
Main: OFF Side
Sub: ON Side
ON/OFF Controller
5
8