3-47
Check
code
Detected
position
Check code
name
Cause
(Position)
Trouble detection
condition
Check item (Position)
94
Indoor
Indoor TC2
sensor alarm
Indoor liquid
pipe temp.
sensor (TC2)
• Sensor resistance
value was infinity or
zero (Open, Short).
• Check connection of TC2 sensor connector
(CN05) (Indoor main P.C. board (MCC-1361)).
• Check characteristics of TC2 sensor
resistance value.
• Check failure of indoor main P.C. board
(MCC-1361).
95
Interface Communication
alarm between
indoor and
outdoor
Inter-unit wire
between
indoor and
outdoor
(PQ control
line)
• Communication was
interrupted for a
certain time.
• There is no inverter
outdoor unit.
• Check power supply of indoor unit.
(Turning on the power.)
• Check power supply of outdoor unit.
(Turning on the power.)
• Check connection and disconnection of
communication line (PQ) between indoor and
outdoor.
• Check connection of communication connector
(CN101) of indoor main P.C. board (MCC-1361).
• Check failure of indoor main P.C. board
(MCC-1361).
• Check failure of outdoor main P.C. board
(Interface).
• Check inverter outdoor set up (Presence of set
up/duplication) when check code [U][–][9][5] is
displayed at outdoor.
96
Interface Disagreement
detection
between indoor
and outdoor
address
Inter-unit wire
between
indoor and
outdoor
(PQ control
line)
• No. of connected
indoor units
exceeded 40.
• Connected to other
outdoor system or
central management
remote controller.
• Check No. of indoor units connected to
outdoor.
• Check connection and miswiring of
communication line (PQ) between indoor and
outdoor.
• Check connection of central management
remote controller wiring.
(Check connection and miswiring of
communication line (XY).)
• Check outdoor P.C. board (Interface) error.
97
Indoor
BUS
communication
alarm (1)
Central
management
system
communication
circuit
Communication of
central management
system interruption
• Check communication line (XY) at outdoor side.
• Check indoor power supply wiring and voltage.
• Check central management controller and
indoor power supply system.
(Check whether one side is not turned on.)
• Check peripheral noise.
• Check failure of indoor main P.C. board.
(MCC-1361)
• Check power failure.
(Trouble may remain at central management
side by power failure. The status returns to
normal status by resetting power supply.)
98
Indoor
BUS
communication
alarm (2)
Central
management
address set up
Addresses duplicated. • Check communication line (XY) at outdoor
side.
• When group operation is performed, check
communication line of server unit.
[NOTE]
When connecting XY communication line to
server unit (No.2 to No.16), check code [98] is
displayed.
• Network address duplication check
• Check failure of Indoor main P.C. board
(MCC-1361).
• Check No. of connected central management
controllers.
(If multiple units are connected, correct to 1
unit.)
• Check central management controller.
