Toshiba MMY-MUP0801HT7JP, Service Manual

Page: 172 / 309

Check code Display of receiving unit
Typical problem site Description of problem
Outdoor 7-segment display Central
control or
main remote
controller
display
Indicator light block
Sub-code
Flash
E06
Number of indoor units from which
signal is received normally
Signal lack of indoor unit E06
• Indoor unit initially communicating normally fails
to return signal (reduction in number of indoor
units connected).
In TU2C-LINK communication system, if the
termination resistance is not set in any of the
indoor units
E07 – (E04)
Indoor-outdoor
communication circuit
trouble Signal cannot be transmitted to indoor units
(
indoor units left without communication from
outdoor unit).
E08 Duplicated indoor address (E08) Duplicated indoor address
More than one indoor unit are assigned same
address (also detected at indoor unit end).
E12
01: Indoor-outdoor communication
02: Outdoor-outdoor
communication
E12
Automatic address starting
trouble
• Indoor automatic address setting is started while
automatic address setting for equipment in other
refrigerant line is in progress.
• Outdoor automatic address setting is started
while automatic address setting for indoor units
is in progress.
E15 – E15
Indoor unit not found
during automatic address
setting
Indoor unit fails to communicate while automatic
address setting for indoor units is in progress.
E16
00: Capacity over
01: Number of units connected
E16
Too many indoor units
connected/capacity over
Combined capacity of indoor units is too large.
The maximum combined of indoor units shown in
the specification table.
E19
00: No header unit
02: Two or more header units
E19
Trouble in number of
outdoor header units There is no or more than one outdoor header unit
in one refrigerant line.
E20
01: Connection of outdoor unit from
other refrigerant line
02: Connection of indoor unit from
other refrigerant line
E20
Connection to other
refrigerant line found
during automatic address
setting
Indoor unit from other refrigerant line is detected
while indoor automatic address setting is in
progress.
E23 – E23
Outdoor-outdoor
communication
transmission trouble
Signal cannot be transmitted to other outdoor
units.
E25 – E25
Duplicated follower
outdoor address There is duplication in outdoor addresses set
manually.
E26
Address of outdoor unit from which
signal is not received normally
E26 Signal lack of outdoor unit
Follower outdoor unit initially communicating
normally fails to do so (reduction in number of
follower outdoor units connected).
Outdoor follower unit
trouble
E28 E28
O
Detected outdoor unit No.
utdoor header unit detects trouble relating to
follower outdoor unit (detail displayed on follower
outdoor unit).
E31 E31
There is no communication between P.C. boards
in inverter box.
– F04 F04
Outdoor discharge
temperature sensor (TD1)
trouble
Outdoor discharge temperature sensor (TD1) has
been open/short-circuited.
F05 – F05
Outdoor discharge
temperature sensor (TD2)
trouble
Outdoor discharge temperature sensor (TD2) has
been open/short-circuited.
F06
01: TE1 sensor
02: TE2 sensor
03: TE3 sensor
Outdoor heat exchanger
liquid side temperature
sensor (TE1, TE2, TE3)
trouble
Outdoor heat exchanger liquid side temperature
sensors (TE1, TE2, TE3) have been open/
short-circuited.
F07
Outdoor liquid temperature
sensor (TL1,TL2,TL3)
trouble
Outdoor liquid temperature sensor (TL1,TL2,TL3)
has been open/short-circuited.
– F08
F06
F07
F08
ALT
ALT
ALT
ALT
ALT
Outdoor outside air
temperature sensor (TO)
trouble
Outdoor air temperature sensor (TO) has been
open/short-circuited.
Outdoor heat exchanger
gas side temperature
sensor (TG1, TG2, TG3)
trouble
Outdoor heat exchanger gas side temperature
sensors (TG1, TG2, TG3) have been open/
short-circuited.
Operation Timer Ready
Circle (O): Trouble P.C. board
01: TL1 sensor
02: TL2 sensor
03: TL3 sensor
F0 F09 ALT 9
01: TG1 sensor
02: TG2 sensor
03: TG3 sensor
P.C. board communication
trouble
Sub MCU
communication trouble
80 : Communication trouble between
MCU and Sub MCU
: Lighting, : Flashing, : Goes off
ALT.: Flashing is alternately when there are two flashing LED
SIM: Simultaneous flashing when there are two flashing LED
P.C.board
Compressor Fan Motor
01
02
03
08
09
0A
0B
10
1
O
O
O
O
2
O
O
O
O
1
O
O
O
O
2
O
1
O
O
O
O
P.C.board
Compressor Fan Motor
11
12
13
18
19
1A
1B
1
O
O
O
O
2
O
O
O
O
2
O
O
O
O
O
O
O
List of Check Codes (Outdoor Unit)
(Check code detected by outdoor interface - typical examples)
If "HELLO" is displayed on the oudoor 7-segment for 1 minute or more, turn off the power supply once and
then turn on the power supply again after passage of 30 seconds or more. When the same symptom appears,
it is considered there is a possibility of I/F board trouble.
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