Troubleshooting By Inferior Phenomena - Mitsubishi Electric PU-P71VHA Service Manual

10-5. TROUBLESHOOTING BY INFERIOR PHENOMENA

Phenomena
(1)Remote controller display does not
work.
(Electric current marker "
displayed on the remote controller.)
Indoor control p.c.board LED
LED1 LED2
1
off 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.
(6)Upward/downward vane performance
fault.
Reference (Meaning of the indoor control board LED)
" is not
LED1 : Micro computer power supply
....Display of DC14V is supply or not from indoor power.
LED2 : Power output supplied to remote controller
....Display 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
1Main power is not turned on. (Power supply inferior)
2Mis-wiring, breaking or contact failure of the connect-
off
ing line.
1Refrigerant address excepts "0".
off
2Mis-wiring, breaking or contact failure of the connect-
ing line.
1Short circuit, miswiring and breaking
–
1At longest 2 minutes after the power supply "PLEASE
WAIT" is displayed to start up.
1Communication fault between the remote controller
and indoor.
2Communication fault between the indoor and outdoor.
3Outdoor unit protection device is opened.
(Abnormal code will be displayed after 2~6 minutes.)
1After cancelling to select function from the remote
controller, the remote controller operation switch will
be not accepted for approx 30 seconds.
1The pair number settings of the wireless remote
controller and indoor control PCB are mismatched.
2Disconnecting of wireless receiving board and contact
failure.
3Factor of the above (1).
1No operation for max. 2 minutes after the power sup-
ply ON.
2Remote 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.
3Factor of the above (2).
1When the unit is as follows in the HEAT mode, the
vane is not downward.
(Working of COOL protection function)
•During HEAT preparation.
•During defrosting.
•During compressor stop.
2When setting the downward vane in the cool/dry
mode, the vane changes to Horizontal position after 1
hour.
3Vane motor does mot rotate.
A) Vane motor fault.
B) Disconnecting, breaking and contact fault of the
connector.
C) Setting to no vane unit.
4Standard position reading fault (Vane motor does not
stop).
A) Limited switch fault.
B) Disconnecting breaking and contact fault of the
connector.
w Only AC timing motor adopting mode. (No limited
switch for stepping motor adopting model.)
Factor
refrigerant address is "0" supplied power output ON.
39
Countermeasure
1Check the power wiring to the outdoor unit and the breaker.
2Check for incorrect wiring, wiring breaks and poor
connections between the indoor and outdoor units.
1Set the refrigerant address to "0" (only 1 refrigerant can be
"0" for group control).
2Check for incorrect wiring, wiring breaks and poor
connections between the indoor and outdoor units.
1Check for shorts, incorrect wiring and wiring breaks in the
remote controller wires.
2Replace the remote controller if the voltage 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:
1If an error is displayed on the remote controller or outdoor
unit's LED within 6 minutes:
Refer to the self-diagnosis table on p. 115 to take
appropriate action.
2If "H0" display remains for 6 minutes:
Failure in indoor control PCB or remote controller
Normal operation
1Check the pair number settings.
2Check the indoor controller board connec-
tor (CN90).
Check the wireless receiving board con-
nector (CNB)
3Check the details of above (1).
1Normal operation
2Normal operation
3Check the details of above (2).
1Normal operation
2Normal operation
3 A) Vane motor resistance value check.
B) Disconnecting, breaking, and contact
fault of the connector.
Stepping motor adopting model
.... CN6V check
AC timing motor adopting model
.... CNV check
C) Check the setting details by selecting
the remote controller function.
Setting check of the indoor controller
board J11~J15 (SW1).
4 A) Limiteds witch (LS) conductance
check.
B) Check the removing of indoor con-
troller board (CN23), breaking line and
contact fault.