Panasonic U-4LE1E5 Service Manual page 108

4. Mini VRF System Alarm Codes
3. Mini VRF System Alarm Codes
E15 Auto-Address Alarm (not enough units)
1. Error Detection Method
It is judged an error not enough indoor units reply to communications and this is determined from the number of indoor
units specified with the outdoor unit. (This is detected even when auto address setting is not used.)
The actual number of indoor units is fewer than that specified at the outdoor unit.
•
• Some indoor unit(s) are connected but power is not turned on.
The CHK pin and/or TEST pin of the indoor unit was shorted when its power was turned on.
•
• High voltage was applied (over AC200V) in the indoor/outdoor operations line circuit.
2. Error Diagnosis
1 Power
1-1
Source
2 Indoor/
2-1
outdoor
control line
2-2
3 No. of
3-1
Indoor
Units
3-2
4 Indoor
4-1
unit
control
PC board
4-2
4-3
4-4
4-5
5
4-6
5 Outdoor
unit control
5-1
PC board
• 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 model's indoor unit board.
• For information on the procedures for replacing the nonvolatile memory (EEPROM) of the indoor unit, refer to the manual
that is packaged with the indoor unit service board.
• For information on the remote control's detailed settings, refer to the Reference Materials.
NOTE
Regarding the PCB photos for individual indoor units, refer to the Section "PCB AND FUNCTIONS" in the TECHNICAL DATA.
OPTION CHK Pin
DC Motor Model Indoor Unit Control PC Board
Is the indoor unit powered off?
Is the indoor/outdoor control line opened or shorted?
Was a high voltage (over AC200V) applied in the indoor/outdoor
operations line circuit?
Was the number of indoor units changed after auto address setting
finished? Or was the setting for the number of indoor units changed
on the control PC board of the outdoor unit?
Conduct checks prior to auto address setting.
Are the CHK pin and/or TEST pin on the indoor unit control board
short-circuited?
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 E15 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 or wireless remote control parts including wiring.
Is the LED blinking on the indoor unit's control PC board?
The nonvolatile memory (EEPROM) on the indoor unit's control board is either not installed,
improperly installed or the nonvolatile memory is faulty. Correct this or after replacing the
nonvolatile memory, write model data to it in the remote control detailed settings mode.
Set the number of the indoor unit setting at No.10 on the outdoor unit's control PC board.
And compare the status of the indoor unit's connection setting at No.9 (indoor unit check).
Then, make a detailed examination of any absent indoor units.
TEST Pin LED EEPROM
(When indoor unit(s) are connected)
RC LED EEPROM OPTION
AC Motor Model Indoor Unit Control PC Board
5 - 20
Mini VRF SYSTEM
Mini VRF SYSTEM
Trouble Diagnosis
Trouble Diagnosis
Yes Power on
No 2-1
Yes Correct the wiring
No 2-2
Yes 3-2
No 3-1
Yes 3-2
No 4-1
Yes Remove the short
No 4-2
Yes 4-3
No 4-5
Yes 4-4
No 4-5
Yes 4-6
No 5-1
CHK Pin RC