5-16
5
E06 Outdoor Unit Failed to Receive Serial Communication Signals from 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.
1.
2.
3
Remove the short
3-2
Are the DISP pin and 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 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 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.
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.
•
EEPROM TEST pin RC
OPTION CHK pin
TEST pin RC
OPTION CHK pin
EEPROM
A746802 : 4-way Cassette Type A746803 : Duct Type
Sec5.indd16Sec5.indd16 2012/03/0920:43:572012/03/0920:43:57
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