Troubleshooting Of Problems; Remote Controller Display Does Not Work - Mitsubishi Electric Mr.SLIM PU-P71VHA Service Manual

11-5. TROUBLESHOOTING OF PROBLEMS

Phenomena
(1) Remote controller display does not
work.
(Electric current marker "
displayed on the remote controller.)
Indoor control P.C. board LED
LED1 LED2
off
1 off
2
Lighting off
(or blinking)
Blinking
3
Lighting
(or lighting)
(2) Remaining "PLEASE WAIT" display
on the remote controller
(3) When pressing the remote controller
operation switch the OPERATION
display is appeared but it will be
turned off soon.
(4) Even controlling by the wireless
remote controller no beep and not
working (Display is available on the
wireless remote controller.)
(5) When operating by the wireless
remote controller, beep sound is
heard without working.
OC379F
Reference (Meaning of the indoor control board LED)
" is not
LED1 : Microprocessor power supply
....Display of DC14V is supply or not from indoor power.
LED2 : Power output supplied to remote controller
....Displays the power condition supplied to wired remote controller. When the
LED3 : Indoor outdoor communication monitor
....Blinking, when receiving the signal normally from the outdoor unit.
LED3
1 Main power is not turned on. (Power supply inferior)
2 Mis-wiring, breaking or contact failure of the connect-
off
ing line
1 Refrigerant address excepts "0"
2 Mis-wiring, breaking or contact failure of the connect-
off
ing line
1 Short circuit, miswiring and breaking
–
1 At longest 2 minutes after the power supply "PLEASE
WAIT" is displayed to start up.
1 Communication fault between the remote controller
and indoor
2 Communication fault between the indoor and outdoor
3 Outdoor unit protection device is opened.
(Abnormal code will be displayed after 2~6 minutes.)
1 After cancelling to select function from the remote
controller, the remote controller operation switch will
be not accepted for approx. 30 seconds.
1 The pair number settings of the wireless remote
controller and indoor control PCB are mismatched
2 Disconnecting of wireless receiving board and
contact failure
3 Factor of the above (1)
1 No operation for max. 2 minutes after the power sup-
ply ON
2 Remote operation is prohibited.
• Remote controlling adaptor is connected to the
indoor controller board (CN32).
• Remote operation is prohibited by centralised con-
troller etc. since it is connected to MELANS.
3 Factor of the above (2)
Factor
refrigerant address is "0" supplied power output ON.
45
Countermeasure
1 Check the power wiring to the outdoor
unit and the breaker.
2 Check for incorrect wiring, wiring breaks
and poor connections between the indoor
and outdoor units.
1 Set the refrigerant address to "0" (only 1
refrigerant can be "0" for group control).
2 Check for incorrect wiring, wiring breaks
and poor connections between the indoor
and outdoor units.
1 Check for shorts, incorrect wiring and wir-
ing breaks in the remote controller wires.
2 Replace the remote controller if the volt-
age to the remote controller terminal
block (TB6) is between 10 and 16V DC.
Normal operation
Turn the power supply OFF/ON, and check
the following:
1 If an error is displayed on the remote
controller or outdoor unit's LED within 6
minutes: Refer to the self-diagnosis table
to take appropriate action.
2 If "H0" display remains for 6 minutes:
Failure in indoor control PCB or remote
controller
Normal operation
1 Check the pair number settings.
2 Check the indoor controller board
connector (CN90).
Check the wireless receiving board
connector (CNB).
3 Check the details of above (1).
1 Normal operation
2 Normal operation
3 Check the details of above (2).