Toshiba MMW-UP0271LQ-E Service Manual page 61

Check code
Main Outdoor 7-segment display
remote
Check
Sub-code
controller
code
01: TK1 sensor
trouble
02: TK2 sensor
trouble
H08 H08
H15 H15 —
01: TK1 oil
circuit trouble
02: TK2 oil
circuit trouble
H16 H16
1∗: Compressor
1 side
2∗: Compressor
2 side
H17 H17
L02 L02 —
L03 — —
L04 L04 —
Location
Description
of
detection
I/F Trouble in
temperature
sensor for oil
level detection
I/F TD2 sensor
miswiring
(incomplete
insertion)
I/F Oil level
detection
circuit trouble
Compressor Compressor
P.C. board trouble
(out of sync)
Indoor unit Outdoor units
model
disagreement
trouble
Indoor unit Duplicated
indoor header
unit
Duplicated
I/F
outdoor line
address
Indoor unit (including Hot Water Module)
Check code detection
System status
condition(s)
All stop Sensor resistance is infinity
or zero (open/short circuit).
All stop Sensor resistance is infinity
or zero (open/short circuit).
All stop Discharge temperature of
(TD2) does not increase
despite compressor 2 being
in operation.
All stop 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.
All stop Judged that the
synchronization could not be
taken.
Stop of In case of different outdoor
corresponding unit (Not corresponded to
unit Air to Air Heat Exchanger
type)
Stop of There are more than one
corresponding header units in group.
unit
All stop There is duplication in line
address setting for outdoor
units belonging to different
refrigerant piping systems.
– 61 –
Check items (locations)
• Check connection of TK1
sensor connector.
• Check resistance
characteristics of TK1
sensor.
• Check for failure in outdoor
P.C. board (I/F).
• Check connection of TK2
sensor connector.
• Check resistance
characteristics of TK2
sensor.
• Check for failure in outdoor
P.C. board (I/F).
• Check installation of TD2
sensor.
• Check connection of TD2
sensor connector and
wiring.
• Check resistance
characteristics of TD2
sensor.
• Check for failure in outdoor
P.C. board (I/F).
• Check for disconnection of
TK1 sensor.
• Check resistance
characteristics of TK1
sensor.
• Check for connection
trouble involving TK1 and
TK2 sensors
• Check for clogging in oil
equalizing circuit capillary.
• Check for refrigerant
entrapment inside
compressor.
• Check for disconnection of
TK2 sensor.
• Check resistance
characteristics of TK2
sensor.
• Check for connection
trouble involving TK1 and
TK2 sensors
• Check SV3F valve
malfunction.
• Check for clogging in oil
equalizing circuit capillary.
• Check for refrigerant
entrapment inside
compressor.
• Check power supply
voltage. (AC380V ± 10%).
• Check for failure in
compressor.
• Check for possible cause
of abnormal overloading.
• Check for failure in outdoor
P.C. board (compressor).
• 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 controller
connection (group/
individual) since indoor
address setting.
• Check line addresses.