OCH790 _74
6831 (E0)/6834 (E4): MA communication receive error
Chart 1 of 2
Abnormal points and detection methods
Detected in remote controller or indoor unit:
•
The main or sub remote controller cannot receive signal
from indoor unit which has the “0” address.
•
The sub remote controller cannot receive signal.
•
The indoor controller board cannot receive signal from
remote controller or another indoor unit.
•
The indoor controller board cannot receive signal.
Causes and checkpoints
•
Contact failure of remote controller wiring
•
Irregular wiring
(A wiring length, number of connecting remote control-
lers or indoor units, or a wiring thickness does not meet
the conditions specified in the chapter “Electrical Work”
in the indoor unit Installation Manual.)
•
Malfunction of the remote controller sending/receiving
circuit in the indoor unit with the LED2 blinking.
•
Malfunction of the remote controller sending/receiving
circuit
•
Remote controller transmitting error caused by noise
interference
Diagnosis of failure
Check the remote controller for
main-sub setting.
Conduct the remote controller diagno
-
sis twice or more times.
Turn the power back ON.
No abnormality
It might be caused by an external noise, so
check the transmission line.
Yes
Set 1 remote controller to main remote
controller, and the other to sub.
Disconnect and reconnect the connec
-
tor CN3A, then turn the power back
ON.
Note:
•
It takes 6 seconds at maximum until the result is displayed.
No abnormality
A connector or wiring contact failure is
suspected.
Replace the remote controller.
Replace the indoor controller board with the
LED2 blinking.
Continue to the next page.
Is error code 6831 or 6834
still displayed?
Is there only 1 remote
controller set as the main
controller?
Is “NG” displayed?
Is “6832” or “ERC”
displayed?
Is “OK” displayed on all
remote controllers?
Does “Please Wait”
disappear within 6 minutes?
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
