Toshiba MMU-UP0071MH-UL Service Manual page 89

Check code
Outdoor 7-segment display
Sub-code
01: TL1 sensor
02: TL2 sensor
F07
03: TL3 sensor
F08 –
01: TG1 sensor
F09
02: TG2 sensor
03: TG3 sensor
01: TS1 sensor
F12 02: TS2 sensor
03: TS3 sensor
F15 –
F16 –
F23 –
F24 –
F31 –
H05 –
H06 –
H07 –
01: TK1 sensor trouble
H08
02: TK2 sensor trouble
H15 –
01: TK1 oil circuit trouble
H16
02: TK2 oil circuit trouble
L02 Detected indoor unit address
L04 –
Number of priority indoor units
L06 (check code L05 or L06 depending
on individual unit)
L08 –
L10 –
Display of receiving unit
Central Indicator light block
control or main
remote
Operation Timer Ready
controller
display
F07
F08
F09
F12
F15
F16
F23
F24
F31
H05
H06
H07
H08
H15
H16
L02
L04
L05
L06
(L08)
L10
– 89 –
Typical problem site
Flash
Outdoor liquid temperature
sensor (TL1,TL2,TL3)
ALT
trouble
Outdoor outside air
ALT temperature sensor (TO)
trouble
Outdoor heat exchanger
gas side temperature
ALT
sensor (TG1, TG2, TG3)
trouble
• Outdoor suction
temperature sensor
(TS1, TS2, TS3) trouble
• When TS3 detects an
ALT unusual temperature
during compressor
operation and PMV4
operation in cooling
mode
Outdoor temperature
ALT sensor (TE1,TL1)
wiring trouble
Outdoor pressure sensor
ALT
(Pd, Ps) wiring trouble
Low pressure sensor (Ps)
ALT
trouble
High pressure sensor (Pd)
ALT
trouble
SIM Outdoor EEPROM trouble
Outdoor discharge
temperature sensor (TD1)
wiring trouble
Activation of low-pressure
protection
Low oil level protection
Trouble in temperature
sensor for oil level
detection
(TK1,TK2)
Outdoor discharge
temperature sensor (TD2)
wiring trouble
Oil level detection circuit
trouble
Indoor unit incompatible
SIM
with A2L refrigerant
Duplicated outdoor
SIM
refrigerant line address
Duplicated priority indoor
unit (as displayed on
SIM
priority indoor unit)
Duplicated priority indoor
unit (as displayed on
SIM
indoor unit other than
priority indoor unit)
Indoor group address not
SIM
set
Outdoor capacity not set
SIM
Description of check code
Outdoor liquid temperature sensor (TL1,TL2,TL3)
has been open/short-circuited.
Outdoor air temperature sensor (TO) has been
open/short-circuited.
Outdoor heat exchanger gas side temperature
sensors (TG1, TG2, TG3) have been open/
short-circuited.
Outdoor suction temperature sensor (TS1,TS2,
TS3) has been open/short-circuited.
Wiring trouble in outdoor temperature sensors
(TE1,TL1) has been detected.
Wiring trouble in outdoor pressure sensors
(Pd, Ps) has been detected.
Output voltage of low pressure sensor (Ps) is zero.
Output voltage of high pressure sensor (Pd) is zero
or provides abnormal readings when compressors
have been turned off.
Outd oor EEPROM is failure (alarm and shutdown
for header unit and continued operation for follower
unit)
Wiring/installation trouble or detachment of
outdoor discharge temperature sensor (TD1)
has been detected.
Low pressure (Ps) sensor detects abnormally low
operating pressure.
Temperature sensor for oil level detection
(TK1,TK2) detects abnormally low oil level.
Temperature sensor for oil level detection
(TK1,TK2) has been open/short-circuited.
Wiring/installation trouble or detachment of
outdoor discharge temperature sensor (TD2) has
been detected.
No temperature change is detected by
temperature sensor for oil level detection
(TK1,TK2) despite compressor having been
started.
Indoor unit incompatible with TU2C-LINK is
connected.
• Indoor unit incompatible with R32 refrigerant is
connected."
Identical refrigerant line address has been
assigned to outdoor units belonging to different
refrigerant piping systems.
More than one indoor unit have been set up as
priority indoor unit.
More than one indoor unit have been set up
as priority indoor unit.
Address setting have not been performed for one
or more indoor units (also detected at indoor end).
Outdoor unit capacity has not been set (after P.C.
board replacement).