Mitsubishi Electric PUMY-P200YKM2 Technical & Service Manual page 82

Check code
6831(E0/E4)
6834(E0/E4)
Abnormal points and detection methods
Detected in remote controller or indoor unit:
When the main or sub remote controller cannot receive signal from
indoor unit which has the "0" address.
When the sub remote controller cannot receive signal.
When the indoor controller board cannot receive signal from remote
controller or another indoor unit.
When the indoor controller board cannot receive signal.
●Diagnosis of defects
Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards
Disconnect and reconnect the
connector CN3A, then turn the
power back ON.
Is the check code
<6831> or <6834>still
displayed?
Yes
Check the remote controller for
main-sub setting.
Is there only 1 remote controller
set as the main controller?
Yes
Conduct the Remote Controller
Diagnosis 2 or more times.
Is "RC OK" displayed on
all remote controllers?
Yes
Turn the power back ON.
Does "HO"or "Please
wait" disappear within
6 minutes?
Yes
Continue to the next page.
OCH675D
MA communication receive error
Diagnosis
No
No
Note:
It takes 6 seconds at maximum
until the result is displayed.
No
Is "RC NG"
Yes
displayed?
No
Is "RC 6832" or
"ERC01"–"ERC66"
displayed?
No
No
Causes and checkpoints
Contact failure of remote controller wirings
Irregular Wiring
(A wiring length, number of connecting remote
controllers 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 on indoor unit with the LED2 is
blinking.
Malfunction of the remote controller sending/
receiving circuit
Remote controller transmitting error caused by noise
interference
No abnormality
A connector or wiring contact failure is
suspected.
Set one remote controller to main remote
controller, and the other to sub.
No abnormality
Yes
It might be caused by an external noise, so
check the transmission line.
Replace the remote controller.
Replace the indoor controller board with
the LED2 is blinking.
82
Chart 1 of 2
Remedy