Mitsubishi Electric PUMY-P100VHM Technical & Service Manual page 51

8-3. REMOTE CONTROLLER TROUBLE
(1) For M-NET remote controller systems
Symptom or inspection code
Though the content of operation is
displayed on the remote
controller, some indoor units do
not operate.
Though the indoor unit operates,
the display of the remote controller
goes out soon.
( ) is not displayed on the remote
controller. (M-NET remote controller
is not fed.)
"HO" keeps being displayed or it
is displayed periodically. ("HO" is
usually displayed about 3 minutes
after the power supply of the
outdoor unit is on.)
The remote controller does not
operate though ( ) is displayed.
(2) For MA remote controller systems
Symptom or inspection code
Though the content of operation is
displayed on the remote controller,
some indoor units do not operate.
Though the indoor unit operates,
the display of the remote
controller goes out soon.
( ) is not displayed on the remote
controller. (MA remote controller is
not fed.)
"PLEASE WAIT" keeps being dis-
played or it is displayed periodically.
("PLEASE WAIT" is usually dis-
played about 3 minutes after the
power supply of the outdoor unit is
on.)
The remote controller does not
operate though ( ) is displayed.
CENTRALLY CONTROLLED 1Hr.
ON OFF ˚C
CLOCK
CHECK
FILTER
CHECK MODE
˚C
TEST RUN
STAND BY
ERROR CODE
NOT AVAILABLE FUNCTION
DEFROST
TEMP.
ON/OFF
CHECK TEST
TIMER SET
• The power supply of the indoor unit is not on.
• The address of the indoor units in same group or the remote controller
is not set correctly.
• The group setting between outdoor units is not registered to the remote
controller.
• The fuse on the indoor unit controller board is blown.
• The power supply of the indoor unit is not on.
• The fuse on the indoor unit controller board is blown.
• The power supply of the outdoor unit is not on.
• The connector of transmission outdoor power board is not connected.
• The number of connected indoor unit in the refrigeration system is over
the limit or the number of connected remote controller is over the limit.
• M-NET remote controller is connected to MA remote controller cable.
• The transmission line of the indoor/outdoor unit is shorted or down.
• M-NET remote controller cable is shorted or down.
• Transmission of outdoor power board failure.
• The power supply for the feeding expansion unit for the transmission
line is not on.
• The address of the outdoor unit remains "00".
• The address of the indoor unit or the remote controller is not set correctly.
• MA remote controller is connected to the transmission line of the
indoor/outdoor unit.
• The transmission line of the indoor/outdoor unit is connected to TB15.
• The transmission line of the indoor/outdoor unit is shorted, down or
badly contacted.
• The power supply of the indoor unit is not on.
• Wiring between indoor units in same group is not finished.
• The indoor unit and Slim model are connected to same group.
• The fuse on the indoor unit controller board is blown.
• The power supply of the indoor unit (Master) is not on.
• In case of connecting the system controller, the setting of the system
controller does not correspond to that of MA remote controller.
• The fuse on the indoor unit (Master) controller board is blown.
The remote controller is not fed until the power supply of both indoor unit
and outdoor unit is on and the start-up of both units is finished normally.
• The power supply of the indoor unit is not on.
• The power supply of the outdoor unit is not on.
• The number of connected remote controller is over the limit
(Maximum: 2 units) or the number of connected indoor unit that is
over the limit (Maximum: 16 units).
• The address of the indoor unit is "00" and the address for the outdoor
unit is the one other than "00".
• The transmission line of the indoor/outdoor unit is connected to TB15.
• MA remote controller is connected to the transmission line of the
indoor/outdoor unit .
• The remote controller cable is shorted or down.
• The power supply cable or the transmission line is shorted or down.
• The fuse on the indoor unit controller board is blown.
• The power supply of the outdoor unit is not on.
• The power supply of the feeding expansion unit for the transmission
line is not on.
• The setting of MA remote controller is not main remote controller, but
sub-remote controller.
• MA remote controller is connected to the transmission line of the
indoor/outdoor unit.
• The power supply of the indoor unit (Master) is not on.
• The transmission line of the indoor/outdoor unit is connected to TB15.
• The transmission line of the indoor/outdoor unit is shorted, down or
badly contacted.
•The fuse on the indoor unit controller board is blown.
51
" " indicator: Appears when current is carried.
FILTER
(M-NET Remote controller)
Cause
Cause
Inspection method and solution
• Check the part where the
abnormality occurs.
1 The entire system
2 In the entire refrigerant system
3 In same group only
4 One indoor unit only
<In case of the entire system or in
the entire refrigerant system>
• Check the self-diagnosis LED
of the outdoor unit.
• Check the items shown in the
left that are related to the
outdoor unit.
<In case of same group only or
one indoor unit only>
• Check the items shown in the
left that are related to the
indoor unit.
Inspection method and solution
• Check the part where the
abnormality occurs.
1 The entire system
2 In the entire refrigerant system
3 In same group only
4 One indoor unit only
<In case of the entire system or in
the entire refrigerant system>
• Check the self-diagnosis LED
of the outdoor unit.
• Check the items shown in the
left that are related to the
outdoor unit.
<In case of same group only or
one indoor unit only>
• Check the items shown in the
left that are related to the
indoor unit.