Toshiba air conditioning fault codes

List of check codes (indoor unit)
L: Lighting, F: Flashing, G: Goes off
ALT: Flashing is alternately when there are two flashing LED
SIM: Simultaneous flashing when there are two flashing LED

Check codeCheck codeCheck codeDisplay of receiving unit
Indicator light block
Display of receiving unit
Indicator light block
Display of receiving unit
Indicator light block
 Typical fault siteDescription of error
TCC-LINKOutdoor 7-segment displaySub-codeOperationTimerReadyFlash
E03--FGGIndoor-remote controller periodic
communication erro
Communication from remote controller or network adaptor has
been lost (so has central control communication)
E04--GGFIndoor-outdoor periodic
communication error
Signals are not being received from outdoor unit.
E08E08 Duplicated indoor addressE08 Duplicated indoor addressFGGDuplicated indoor addressIndoor unit detects address identical to its own.
E10--FGGIndoor inter-MCU communication
error
MCU communication between main controller and motor
microcontroller is faulty
E18--FGGError in periodic communication
between indoor header and
follower unit
Periodic communication between indoor header and follower units
cannot be maintained
F01--FFGALTIndoor heat exchanger
temperature sensor (TCJ) error
Heat exchanger temperature sensor (TCJ) has been open /
shortcircuited
F02--FFGALTIndoor heat exchanger
temperature sensor (TC2) error
Heat exchanger temperature sensor (TC2) has been open /
shortcircuited
F03--FFGALTIndoor heat exchanger
temperature sensor (TC1) error
Heat exchanger temperature sensor (TC1) has been open /
shortcircuited.
F10--FFGALTAmbient temperature sensor (TA)
error
Ambient temperature sensor (TA) has been open / short-circuited
F11--FFGALTDischarge temperature sensor
(TF) error
Discharge temperature sensor
ALT
(TF) error
F29--FFGSIMSIM P.C. board or other indoor errorIndoor EEPROM is abnormal (some other error may be detected)
L03--FGFSIMDuplicated indoor group header
unit
There is more than one header unit in group.
L07--FGFSIMConnection of group control cable
to stand-alone indoor unit
There is at least one stand-alone indoor unit to which group control
cable is connected
L08L08-FGFSIMSIM Indoor group address not setAddress setting has not been performed for one or more indoor
units (also detected at outdoor unit end).
L09--FGFSIMSIM Indoor capacity not setCapacity setting has not been performed for indoor unit
L20--FLFSIMDuplicated central control address There is duplication in central control address setting
L30L30 Detected indoor unit No.FLFSIMIndoor external error input
(interlock)
Unit shutdown has been caused by external error input (CN80).
P01--GFFALTALT Indoor AC fan errorIndoor AC fan error is detected (activation of fan motor thermal
relay)
P10P10Detected indoor unit No.GFFALTALT Indoor overflow errorFloat switch has been activated
P12--GFFALTALT Indoor DC fan errorIndoor DC fan error (e.g. overcurrent or lock-up) is detected
P31--FGFALTALT Other indoor unit errorFollower unit cannot be operated due to header unit alarm (E03 /
L03 / L07 / L08)
E01--FGGNo master remote controller,
faulty remote controller
communication (reception)
Signals cannot be received from indoor unit; master remote
controller has not been set (including two remote controller
control).
E02--FGGFaulty remote controller
communication (transmission)
Signals cannot be transmitted to indoor unit.
E02--FGGDuplicated master remote
controller
Both remote controllers have been set as master remote
controller in two remote controller control (alarm and
shutdown for header unit and continued operation for
follower unit)
C05--Faulty central control
communication (transmission)
Central control device is unable to transmit signal due to
duplication of central control device (AI-NET)
C06--Faulty central control
communication (reception)
Central control device is unable to receive signal.
---Multiple network adaptersMultiple network adapters are connected to remote
controller communication line (AI-NET)
C12--Blanket alarm for general
purpose device control
interface
Device connected to general-purpose device control
interface for TCC-LINK / AI-NET is faulty.
P30--Group control follower unit
error
Group follower unit is faulty (unit No. and above detail
[∗∗∗] displayed on main remote controller)

Toshiba air conditioning fault codes
List of check codes (outdoor unit)
(Errors detected by SMMS outdoor interface – typical examples)

Check codeCheck codeCheck codeDisplay of receiving unit
Indicator light block
Display of receiving unit
Indicator light block
Display of receiving unit
Indicator light block
 Typical fault siteDescription of error
Sub-codeOutdoor 7-segment displayTCC-LINKOperationTimerReadyFlash
E06Number of indoor units from which
signal is received normally
E06GGFDropping out of indoor unitIndoor unit initially communicating normally fails to
return signal (reduction in number of indoor units
connected)
E07-(E04)GGFIndoor-outdoor
communication circuit
error
Signal cannot be transmitted to indoor units
(→
indoor units left without communication from
outdoor unit)
E08Duplicated indoor address(E08)FGGDuplicated indoor addressMore than one indoor unit is assigned same
address (also detected at indoor unit end)
E1201: Indoor-outdoor communication
02: Outdoor-outdoor
communication
E12FGGAutomatic address starting
error

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-E15GGFIndoor unit not found
during automatic address
setting
Indoor unit fails to communicate while automatic
address setting for indoor units is in progress
E1600: Overloading
01: Number of units connected
E16GGFToo many indoor units
connected / overloading
Combined capacity of indoor units is too large
(more than 135 % of combined capacity of outdoor
units)
E1900: No header unit
02: Two or more header units
E19GGFError in number of outdoor
header units
There is no or more than one outdoor header unit
in one refrigerant line
E2001: Connection of outdoor unit from
other refrigerant line
02: Connection of indoor unit from
other refrigerant line
E20GGFConnection 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-E23GGFOutdoor-outdoor
communication
transmission error
Signal cannot be transmitted to other outdoor
units
E25-E25GGFDuplicated follower
outdoor address
There is duplication in outdoor addresses set
manually.
E26Address of outdoor unit from which
signal is not received normally
E26GGFDropping out of outdoor
unit
Follower outdoor unit initially communicating
normally fails to do so (reduction in number of
follower outdoor units connected)
E28 Detected outdoor unit NoE28 GGFOutdoor follower unit errorOutdoor header unit detects fault relating to
follower outdoor unit (detail displayed on follower
outdoor unit)
E31-E31GGFIPDU communication errorThere is no communication between IPDUs (P.C.
boards) in inverter box
F04-F04FFLALTOutdoor discharge
temperature sensor (TD1)
error
Outdoor discharge temperature sensor (TD1) has
been open / short-circuited
F05-F05FFLALTOutdoor discharge
temperature sensor (TD2)
error
Outdoor discharge temperature sensor (TD2) has
been open / short-circuited
F0601: TE1
02: TE2
F06FFLALTOutdoor heat exchanger
temperature sensor (TE1,
TE2) error
Outdoor heat exchanger temperature sensors
(TE1, TE2) have been open / short-circuited
F07-F07FFLALTOutdoor liquid temperature
sensor (TL) error
Outdoor liquid temperature sensor (TL) has been
open / short-circuited
F08-F08FFLALTOutdoor outside air
temperature sensor (TO)
error
Outdoor outside air temperature sensor (TO) has
been open / short-circuited
F11-F11
F12-F12FFLALTOutdoor suction
temperature sensor (TS1)
error
Outdoor suction temperature sensor (TS1) has
been open / short-circuited
F1301: Compressor 1
02: Compressor 2
03: Compressor 3
F13FFLALTOutdoor IGBT built-in
temperature sensor (TH)
error
Open-circuit or short-circuit of the outdoor IGBT
built-in temperature sensor (TH) was detected.
F15-F15FFLALTOutdoor temperature
sensor (TE1, TL) wiring
error
Wiring error in outdoor temperature sensors (TE1,
TL) has been detected
F16-F16FFLALTOutdoor pressure sensor
(Pd, Ps) wiring error
Wiring error in outdoor pressure sensors (Pd, Ps)
has been detected
F22-F22FFLALTOutdoor discharge
temperature sensor (TD3)
error
Outdoor discharge temperature sensor (TD3) has
been open / short-circuited
F23-F23FFLALTLow pressure sensor (Ps)
error
Output voltage of low pressure sensor (Ps) is zero
F24-F24FFLALTHigh pressure sensor (Pd)
error
Output voltage of high pressure sensor (Pd) is zero
or provides abnormal readings when compressors
have been turned off
F31-F31FFLSIMOutdoor EEPROM errorOutdoor EEPROM is faulty (alarm and shutdown
for header unit and continued operation for follower
unit)
H0101: Compressor 1
02: Compressor 2
03: Compressor 3
H01GFGCompressor breakdownOvercurrent of the inverter current (Idc) detection
circuit was detected
H0201: Compressor 1
02: Compressor 2
03: Compressor 3
H02GFGCompressor error (Lock)Compressor lock was detected
H0301: Compressor 1
02: Compressor 2
03: Compressor 3
H03GFGCurrent detection circuit
error
Current error was detected while the compressor
was stopped
H04-H04GFGCompressor 1 case
thermo activation
Compressor 1 case thermo was activated for
protection
H05-H05GFGOutdoor discharge
temperature sensor (TD1)
wiring error
Wiring / installation error or detachment of outdoor
discharge temperature sensor (TD1) has been
detected
H06-H06GFGActivation of low-pressure
protection
Low pressure (Ps) sensor detects abnormally low
operating pressure
H07-H07GFGActivation of low-pressure
protection
Temperature sensor for oil level detection (TK1-5)
detects abnormally low oil level
H0801: TK1 sensor error
02: TK2 sensor error
03: TK3 sensor error
04: TK4 sensor error
05: TK5 sensor error
H08GFGError in temperature
sensor for oil level
detection (TK1-5)
Temperature sensor for oil level detection (TK1-5)
has been open / short-circuited
H14-H14GFGCompressor 2 case
thermo activation
Compressor 2 case thermo was activated for
protection
H15-H15GFGOutdoor discharge
temperature sensor (TD2)
wiring error
Wiring / installation error or detachment of outdoor
discharge temperature sensor (TD2) has been
detected
H1601: TK1 oil circuit error
02: TK2 oil circuit error
03: TK3 oil circuit error
04: TK4 oil circuit error
05: TK5 oil circuit error
H16GFGOil level detection circuit
error
No temperature change is detected by
temperature sensor for oil level detection (TK1-5)
despite compressor having been started
H25-H25GFGOutdoor discharge
temperature sensor (TD3)
wiring error
Wiring / installation error or detachment of outdoor
discharge temperature sensor (TD3) has been
detected
L04-L04FLFSIMDuplicated outdoor
refrigerant line address
Identical refrigerant line address has been
assigned to outdoor units belonging to different
refrigerant piping systems
L06Number of priority indoor units
(check code L05 or L06 depending
on individual unit)
L05FGFSIMDuplicated priority indoor
unit (as displayed on
priority indoor unit)
More than one indoor unit has been set up as
priority indoor unit.
L06Number of priority indoor units
(check code L05 or L06 depending
on individual unit)
L06FGFSIMDuplicated priority indoor
unit (as displayed on
indoor unit other than
priority indoor unit)
More than one indoor unit has been set up as
priority indoor unit
L08-L08FGFSIMSIM Indoor group address not
set
Address setting has not been performed for one or
more indoor units (also detected at indoor end)
L10-L10FLFSIMOutdoor capacity not setOutdoor unit capacity has not been set (after P.C.
board replacement)
L17-L17FLFSIMOutdoor model
incompatibility error
Old model outdoor unit (prior to 3 series) has been
connected.
L18-L18FLFSIMFS (Flow Selector) unit
error
Cooling / heating cycle error resulting from piping
error is detected
L28L28FLFSIMToo many outdoor units
connected
More than four outdoor units have been
connected
L29SMMS (Series 1)
01: A3-IPDU1 error
02: A3-IPDU2 error
03: A3-IPDU1/A3-IPDU2 error
04: Fan IPDU error
05: A3-IPDU1
+ Fan IPDU error
06: A3-IPDU2
+ Fan IPDU error
07: All IPDU error
SMMS-i (Series 4)
L29FLFSIMError in number of IPDUsThere are insufficient number of IPDUs (P.C.
boards) in inverter box.
L30 Detected indoor unit No.L30 FLFSIMIndoor external error input
(interlock)
Indoor unit has been shut down for external error
input in one refrigerant line (detected by indoor
unit)
P03-FGFALTOutdoor discharge (TD1)
temperature error
Outdoor discharge temperature sensor (TD1) has
detected abnormally high temperature
P04P0301: Compressor 1
02: Compressor 2
03: Compressor 3
P04FGFALTHigh-pressure SW
activation
High-pressure SW was activated.
P0500: Open phase detectedP05FGFALTOpen phase / power failureOpen phase is detected when power is turned on.
Inverter DC voltage is too high (overvoltage) or too
low (undervoltage)
P0501: Compressor 1
02: Compressor 2
03: Compressor 3
P05FGFALTInverter DC voltage (Vdc)
error
MG-CTT error
Open phase is detected when power is turned on.
Inverter DC voltage is too high (overvoltage) or too
low (undervoltage)
P0701: Compressor 1
02: Compressor 2
03: Compressor 3
P07FGFALTHeat sink overheating
error
Temperature sensor built into IGBT (TH) detects
overheating
P10Indoor unit No. detectedP10GFFALTIndoor unit overflowIndoor unit has been shutdown in one refrigerant
line due to detection of overflow (detected by
indoor unit).
P13-P13GFFALTOutdoor liquid backflow
detection error
State of refrigerant cycle circuit indicates liquid
backflow operation
P1501: TS condition
02: TD condition
P15FGFALTGas leak detectionOutdoor suction temperature sensor (TS1) detects
sustained and repeated high temperatures that
exceed standard value
P17-P17FGFALTOutdoor discharge (TD2)
temperature error
Outdoor discharge temperature sensor (TD2)
detects abnormally high temperature
P18-P18FGFALTOutdoor discharge (TD3)
temperature error
Outdoor discharge temperature sensor (TD3)
detects abnormally high temperature
P19Outdoor unit No. detectedP19FGFALT4-way valve reversing
error
Abnormality in refrigerating cycle is detected
during heating operation
P20-P20FGFALTActivation of high-pressure
protection
High pressure (Pd) sensor detects high pressure
that exceeds standard value
F1301: Compressor 1
02: Compressor 2
03: Compressor 3
F13FFLALTError in temperature
sensor built into indoor
IGBT (TH)
Temperature sensor built into indoor IGBT (TH)
has been open / short-circuited.
H0101: Compressor 1
02: Compressor 2
03: Compressor 3
H01GFGCompressor breakdownInverter current (Idc) detection circuit detects
overcurrent
H0201: Compressor 1
02: Compressor 2
03: Compressor 3
H02GFGCompressor error (lockup)Compressor lockup is detected
H0301: Compressor 1
02: Compressor 2
03: Compressor 3
H03GFGCurrent detection circuit
error
Abnormal current is detected while inverter
compressor is turned off
P0401: Compressor 1
02: Compressor 2
03: Compressor 3
P04FGFALTActivation of high-pressure
SW
High-pressure SW is activated
P07P07FGFALTHeat sink overheating
error
Temperature sensor built into IGBT (TH) detects
overheating
P20P20FGFALTHigh-pressure protection
activation
High-pressure (Pd) sensor detected a value over
the criteria
P22SMMS (Series 1)
04: Rotation difference error
06: Maximum rotation exceeded
08: Out of step
0A: Idc activation
0C: Fan lock
0d: Lock
0E: Sync error
0F: Control error
SMMS-i (Series 4)
0..: IGBT circuit
1..: Position detection circuit error
3..: Motor lockup error
4..: Motor current detection
C..: TH sensor error
D..: TH sensor error
E..: Inverter DC voltage error
(outdoor fan)
Note: Although letters 0 to F appear
at locations indicated by "∗",
please ignore them
P22FGFALTOutdoor fan IPDU errorOutdoor fan IPDU detects error.
P2601: Compressor 1
02: Compressor 2
03: Compressor 3
P26FGFALTActivation of G-Tr (IGBT)
short-circuit protection
Short-circuit protection for compressor motor
driver circuit components is activated (momentary
overcurrent)
P2901: Compressor 1
02: Compressor 2
03: Compressor 3
P29FGFALTCompressor position
detection circuit error
Compressor motor position detection error is
detected

The above check codes are examples only, and different check codes may be displayed depending on the outdoor unit configuration
(e.g. a Super heat recovery multi system). For details, see the service manual for the outdoor unit