Toshiba MMD-AP0721HP-UL1 Service Manual page 51

List of Check Codes (Outdoor Unit)
(Check code detected by SMMS-e 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.
Check code
Outdoor 7-segment display
Sub-code
Number of indoor units from which
E06
signal is received normally
E07 –
E08 Duplicated indoor address
01: Indoor-outdoor communication
E12 02: Outdoor-outdoor
communication
E15 –
00: Overloading
E16
01: Number of units connected
00: No header unit
E19
02: Two or more header units
01: Connection of outdoor unit from
other refrigerant line
E20
02: Connection of indoor unit from
other refrigerant line
E23 –
E25 –
Address of outdoor unit from which
E26
signal is not received normally
E 2 8 D e e t c e t d o u d t o r o u n t i N . o
A3-IPDU Fan-IPDU A3-IPDU
1 2 1 2 1 2
01 ○ 10
02 ○ 11 ○
03 ○ ○ 12 ○
08 ○ 13 ○ ○
09 ○ ○ 18
E 3 1
0A ○ ○ 19 ○
0B ○ ○ ○ 1A ○
1B ○ ○
Circle (O): IPDU
trouble 80 : Communication trouble between
MCU and Sub MCU
F 0 4 –
F05 –
01: TE1
F06
02: TE2
01: TL1
F 0 7 –
02: TL2
03: TL3
F 0 8 –
01: TG1
F09
02: TG2
Display of receiving unit
TCC-LINK Indicator light block
central control
or main remote
Operation Timer Ready
control
display
E 0 6
(E04)
(E08)
E12
E15
E16
E19
E20
E23
E25
E26
E 2 8
Fan-IPDU
1 2
○
○
○
○
○ ○
E 3 1
○ ○
○ ○
○ ○
F 0 4
F05
F 0 6
F 0 7
F 0 8
- 51 -
IPDU: Intelligent Power Drive Unit (Inverter P.C. board)
: Lighting, : Flashing,
ALT.: Flashing is alternately when there are two flashing LED
SIM: Simultaneous flashing when there are two flashing LED
Typical problem site
Flash
Indoor unit initially communicating normally fails to
Signal lack of indoor unit
return signal (reduction in number of indoor units
connected).
Indoor-outdoor Signal cannot be transmitted to indoor units
communication circuit ( indoor units left without communication from
trouble
outdoor unit).
More than one indoor unit are assigned same
Duplicated indoor address
address (also detected at indoor unit end).
• Indoor automatic address setting is started while
automatic address setting for equipment in other
Automatic address starting refrigerant line is in progress.
trouble
• Outdoor automatic address setting is started
while automatic address setting for indoor units
is in progress.
Indoor unit not found
Indoor unit fails to communicate while automatic
during automatic address
address setting for indoor units is in progress.
setting
Combined capacity of indoor units is too large
Too many indoor units
(more than 135% of combined capacity of outdoor
connected/overloading
units).
Trouble in number of
There is no or more than one outdoor header unit
outdoor header units in one refrigerant line.
Connection to other
Indoor unit from other refrigerant line is detected
refrigerant line found
while indoor automatic address setting is in
during automatic address
progress.
setting
Outdoor-outdoor
Signal cannot be transmitted to other outdoor
communication
units.
transmission trouble
Duplicated follower There is duplication in outdoor addresses set
outdoor address manually.
Follower outdoor unit initially communicating
Signal lack of outdoor unit
normally fails to do so (reduction in number of
follower outdoor units connected).
Outdoor follower unit Outdoor header unit detects fault relating to
trouble
follower outdoor unit (detail displayed on follower
outdoor unit).
IPDU communication There is no communication between IPDUs (P.C.
trouble Sub MCU
boards) in inverter box.
communication trouble
Outdoor discharge
Outdoor discharge temperature sensor (TD1) has
A L T temperature sensor (TD1)
been open/short-circuited.
trouble
Outdoor discharge
Outdoor discharge temperature sensor (TD2) has
ALT temperature sensor (TD2)
been open/short-circuited.
trouble
Outdoor heat exchanger liquid side temperature
Outdoor heat exchanger
liquid side temperature
A L T sensors (TE1, TE2) have been open/short-
sensor (TE1, TE2) trouble
circuited.
Outdoor liquid temperature Outdoor liquid temperature sensor (TL1,TL2,TL3)
A L T
sensor (TL1,TL2,TL3) has been open/short-circuited.
trouble
Outdoor outside air
Outdoor outside air temperature sensor (TO) has
A L T temperature sensor (TO)
been open/short-circuited.
trouble
Outdoor heat exchanger gas side temperature
Outdoor heat exchanger
sensors (TG1, TG2) have been open/short-
gas side temperature
sensor (TG1, TG2) trouble
circuited.
: Goes off
Description of problem