Toshiba MMW-UP0271LQ-E Service Manual page 49

Check code
Outdoor 7-segment display
Sub-code
01: TS1 sensor
F12
03: TS3 sensor
04 TS3 sensor disconnect
F15 –
F16 –
F19 –
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
L04 –
Number of priority indoor units
L06 (check code L05 or L06 depending
on individual unit)
L08
–
L10 –
L17 –
02: Switch setting trouble of
L23
outdoor unit
L28 –
Indoor unit (including Hot Water Module)
Central
Typical problem site
control or main
remote
controller
display
• Outdoor suction
temperature sensor
(TS1,TS3) trouble
• When TS3 detects an
F12
unusual temperature
during compressor
operation and PMV4
operation in cooling mode
Outdoor temperature
F15 sensor (TE1,TL1)
wiring trouble
Outdoor pressure sensor
F16
(Pd, Ps) wiring trouble
Indoor TCJ2 (TF) sensor
F19
trouble
Low pressure sensor (Ps)
F23
trouble
High pressure sensor (Pd)
F24
trouble
F31 Outdoor EEPROM trouble
Outdoor discharge
H05 temperature sensor (TD1)
wiring trouble
Activation of low-pressure
H06
protection
H07
Low oil level protection
Trouble in temperature
sensor for oil level
H08
detection
(TK1,TK2)
Outdoor discharge
H15 temperature sensor (TD2)
wiring trouble
Oil level detection circuit
H16
trouble
Duplicated outdoor
L04
refrigerant line address
Duplicated priority indoor
unit (as displayed on
L05
priority indoor unit)
Duplicated priority indoor
unit (as displayed on
L06
indoor unit other than
priority indoor unit)
Indoor group address not
(L08)
set
Outdoor capacity not set
L10
Outdoor model
L17
incompatibility trouble
L23 Switch setting trouble
Too many outdoor units
L28
connected
– 49 –
Description of problem
• Outdoor suction temperature sensor
(TS1,TS3) has been open/short-circuited.
• When the disconnect of outdoor temperature
sensor (TS3) is detected.
Wiring trouble in outdoor temperature sensors
(TE1,TL1) has been detected.
Wiring trouble in outdoor pressure sensors
(Pd, Ps) has been detected.
• Check connection of TCJ2 (TF) sensor connector.
• Check resistance characteristics of TCJ2 (TF)
sensor.
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 trouble (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.
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).
Old model outdoor unit has been connected.
Switch setting trouble of outdoor units when
HWM (Hot Water module) is connected.
More than three outdoor units have been
connected.