Remote Controller Diagnosis - Mitsubishi Electric PUMY-P112VKM3 Technical & Service Manual

8-2. REMOTE CONTROLLER DIAGNOSIS

· For M-NET remote controller system
If the air conditioner cannot be operated from the remote controller, diagnose the remote controller as explained below.
First, check that the power-on indicator is lit.
1
If the correct voltage (12 V DC) is not supplied to the remote controller, the
indicator will not light.
If this occurs, check the remote controller's wiring and the indoor unit.
Switch to the remote controller self-diagnosis mode.
2
Press the button for 5 seconds or more. The display content will
CHECK
change as shown below.
Remote controller self-diagnosis result
3
[When the remote controller is functioning correctly]
Check for other possible causes, as there is no problem with the remote
controller.
[Where the remote controller is not defective, but cannot be operated.]
(Error display 2) [E3], [6833] or [6832] flashes. → Transmission is not possible.
There might be noise or interference on the transmission path, or the indoor unit
or other remote controllers are defective. Check the transmission path and other
controllers.
To cancel remote controller diagnosis
4
Press the CHECK button for 5 seconds or more. Remote controller diagnosis will be cancelled, "PLEASE WAIT" and operation lamp will flash.
After approximately 30 seconds, the state in effect before the diagnosis will be restored.
OCH632A
Press the FILTER button to start self-diagnosis.
[When the remote controller malfunctions]
(Error display 1) "NG" flashes. → The remote controller's transmitting-receiv-
ing circuit is defective.
The remote controller must be replaced with a new one.
(Error display 3) "ERC" and the number of data errors are displayed.
→ Data error has occurred.
The number of data errors is the difference between the number of bits sent from
the remote controller and the number actually transmitted through the transmis-
sion path. If such a problem is occurring, the transmitted data is affected by noise,
etc. Check the transmission path.
When the number of data errors is "02":
Transmission data from remote controller
Transmission data on transmission path
104
Power on indicator