Toshiba MMD-AP0481HF2UL Service Manual page 67

Check code
Main
Outdoor 7-segment display
remote
Check
Sub-code
control
code
01: TK1 oil circuit trouble
02: TK2 oil circuit trouble
03: TK3 oil circuit trouble
04: TK4 oil circuit trouble
05: TK5 oil circuit trouble
H16 H16
H25 H25 —
L02 L02 —
L03 — —
L04 L04 —
L05 — —
Location
of
Description System status
detection
I/F Oil level All stop
detection
circuit trouble
I/F TD3 sensor All stop
miswiring
Indoor Outdoor units Stop of
unit model corresponding
disagreement unit
trouble
Indoor Duplicated Stop of
unit indoor header corresponding
unit unit
I/F Duplicated All stop
outdoor line
address
I/F Duplicated All stop
priority indoor
unit (as
displayed on
priority indoor
unit)
Trouble detection
condition(s)
No temperature change is detected
by TK1 despite compressor 1
having been started.
No temperature change is detected
by TK2 despite compressor 2
having been started.
No temperature change is detected
by TK3 despite compressor having
been started.
No temperature change is detected
by TK4 despite compressor having
been started.
No temperature change is detected
by TK5 despite compressor having
been started.
Air discharge temperature (TD3)
does not increase despite
compressor 3 being in operation.
In case of different outdoor unit
(Not corresponded to Air to Air
Heat Exchanger type)
There are more than one header
units in group.
There is duplication in line address
setting for outdoor units belonging
to different refrigerant piping
systems.
More than one indoor units have
been set up as priority indoor unit.
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Check items (locations)
• Check for disconnection of TK1
sensor.
• Check resistance characteristics
of TK1 sensor.
• Check for connection trouble
involving TK1, TK2, TK3, TK4,
and TK5 sensors
• Check for clogging in oil
equalizing circuit capillary and
faulty operation in check valve.
• Check for refrigerant entrapment
inside compressor.
• Check for disconnection of TK2
sensor.
• Check resistance characteristics
of TK2 sensor.
• Check for connection trouble
involving TK1, TK2, TK3, TK4,
and TK5 sensors
• Check for clogging in oil
equalizing circuit capillary and
faulty operation in check valve.
• Check for refrigerant entrapment
inside compressor.
• Check for disconnection of TK3
sensor.
• Check resistance characteristics
of TK3 sensor.
• Check for connection trouble
involving TK1, TK2,TK3, TK4,
and TK5 sensors
• Check for clogging in oil
equalizing circuit capillary and
faulty operation in check valve.
• Check for refrigerant entrapment
inside compressor.
• Check for disconnection of TK4
sensor.
• Check resistance characteristics
of TK4 sensor.
• Check for connection trouble
involving TK1, TK2, TK3, TK4,
and TK5 sensors
• Check for clogging in oil
equalizing circuit capillary and
faulty operation in check valve.
• Check for refrigerant entrapment
inside compressor.
• Check for disconnection of TK5
sensor.
• Check resistance characteristics
of TK5 sensor.
• Check for connection trouble
involving TK1, TK2, TK3, TK4,
and TK5 sensors
• Check for clogging in oil
equalizing circuit capillary and
faulty operation in check valve.
• Check for refrigerant entrapment
inside compressor.
• Check installation of TD3 sensor.
• Check connection of TD3 sensor
connector and wiring.
• Check resistance characteristics
of TD3 sensor.
• Check for defect in outdoor P.C.
board (I/F).
• Check outdoor unit model.
(Check whether the outdoor unit
corresponds to Air to Air Heat
Exchanger type or not.)
• Check indoor addresses.
• Check for any change made to
remote control connection
(group/individual) since indoor
address setting.
• Check line addresses.
• Check display on priority indoor
unit.