Remote Controller Diagnosis - Mitsubishi Electric PU-P71VHA Service Manual

D
Press the button twice within three seconds. The self-diagnosis
ON/OFF
address or refrigerant address will flash.
5
Cancel self-diagnosis.
Self-diagnosis can be cancelled by the following two methods.
H
Press the button twice within three seconds.
CHECK
5
Press the button.
ON/OFF

10-3-3. Remote Controller Diagnosis

If the air conditioner cannot be operated from the remote controller, diagnose the remote controller as explained below.
1
First, check that the power-on indicator is lit.
If the correct voltage (DC12 V) 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.
2
Switch to the remote controller self-diagnosis mode.
H
Press the button for five seconds or more. The display content will
CHECK
change as shown below.
3
Remote controller self-diagnosis result
[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.
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.
4
To cancel remote controller diagnosis
H
Press the button for five seconds or more. Remote controller diagnosis will be cancelled, "PLEASE WAIT" and operation lamp will flash. After
CHECK
approximately 30 seconds, the state in effect before the diagnosis will be restored.
When the error history is reset, the display will look like the one shown below.
However, if you fail to reset the error history, the error content will be displayed again.
Self-diagnosis will be cancelled and the screen will return to the previous state in effect before the start
of self-diagnosis.
Self-diagnosis will be cancelled and the indoor unit will stop.
A
[When the remote controller malfunctions]
(Error display 1) "NG" flashes.
The remote controller must be replaced with a new one.
Transmission is not possible. (Error display 3) "ERC" and the number of data errors are displayed.
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.
28
Press the button to start self-diagnosis.
FILTER
The remote controller's transmitting-receiv-
ing circuit is defective.
Data error has occurred.
When the number of data errors is "02":
Transmission data from remote controller
Transmission data on transmission path
Power on indicator