Mitsubishi Electric CITY MULTI PUMY-P112VKM5 Technical & Service Manual page 100

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.
The display of the remote controller
does not come up.
˝Startup screen˝ keeps being
displayed or it is displayed periodically.
(˝Startup screen˝ is usually displayed
about 3 minutes after the power
supply of the outdoor unit is on.)
The remote controller does not
operate.
(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.
The display of the remote controller
does not come up.
˝Please Wait˝ keeps being displayed
or it is displayed periodically.
(˝Please Wait˝ is usually displayed
about 3 minutes after the power supply
of the outdoor unit is on.)
The remote controller does not
operate.
OCH740
Cause
• 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 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.
Cause
• 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 the 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 startup 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.
100
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 1 indoor unit only
<In the 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 the case of in same group only
or 1 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 1 indoor unit only
<In the 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 the case of in same group only
or 1 indoor unit only>
• Check the items shown in the left
that are related to the indoor unit.