Toshiba MMU-P0121H Service Manual page 50

Check Detected Check code
code position name
94 Indoor Indoor TC2
sensor alarm
95 Interface Communication
alarm between
indoor and
outdoor
96 Interface Disagreement
detection
between indoor
and outdoor
address
97 Indoor BUS
communication
alarm (1)
98 Indoor BUS
communication
alarm (2)
Cause Trouble detection
(Position) condition
Indoor liquid • Sensor resistance
pipe temp. value was infinity or
sensor (TC2) zero (Open, Short).
Inter-unit wire • Communication was
between interrupted for a
indoor and certain time.
outdoor
• There is no inverter
(PQ control
outdoor unit.
line)
Inter-unit wire • No. of connected
between indoor units
indoor and exceeded 40.
outdoor
• Connected to other
(PQ control
outdoor system or
line)
central management
remote controller.
Central Communication of
management central management
system system interruption
communication
circuit
Addresses duplicated. • Check communication line (XY) at outdoor
Central
management
address set up
3-47
Check item (Position)
• 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).
• 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.
• 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.
• 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.)
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.