Toshiba MMW-UP0271LQ-E Service Manual page 59

Check code
Main Outdoor 7-segment display
remote
Check
Sub-code
controller
code
F11 — —
01: TS1 sensor
trouble
03: TS3 sensor
trouble
F12 F12
04: TS3 sensor
disconnect
1∗: Compressor
1 side
F13 F13
2∗: Compressor
2 side
F15 F15 —
F16 F16 —
F23 F23 —
F24 F24 —
F29 — —
F31 F31 —
*1 Total shutdown in case of header unit
Continued operation in case of follower unit
Location
Description
of
detection
Indoor unit Indoor TF
sensor trouble
I/F TS1/TS3
sensor trouble
Compressor TH sensor
P.C. board trouble
I/F Outdoor
temperature
sensor wiring
trouble (TE1,
TL1)
I/F Outdoor
pressure
sensor wiring
trouble (Pd, Ps)
I/F Ps sensor
trouble
I/F Pd sensor
trouble
Indoor unit Other indoor
trouble
I/F Outdoor
EEPROM
trouble
Indoor unit (including Hot Water Module)
Check code detection
System status
condition(s)
Stop of Sensor resistance is infinity
corresponding or zero (open/short circuit).
unit
All stop • Sensor resistance is infinity
or zero (open/short circuit).
• When TS3 detects an
unusual temperature
during compressor
operation and PMV4
operation in cooling mode.
All stop Sensor resistance is infinity
or zero (open/short circuit).
All stop During compressor
operation in HEAT mode,
TL1 continuously provides
temperature reading higher
than indicated by TL1 by at
least specified margin for 3
minutes or more.
All stop Readings of high-pressure
Pd sensor and low-pressure
Ps sensor are switched.
Output voltages of both
sensors are zero.
All stop Output voltage of Ps
sensor is zero.
All stop Output voltage of Pd sensor
is zero (sensor open-
circuited).
Pd > 4.15MPa despite
compressor having been
turned off.
Stop of Indoor P.C. board does not
corresponding operate normally.
unit
All stop *1 Outdoor P.C. board (I/F)
does not operate normally.
– 59 –
Check items (locations)
• Check connection of TF
sensor connector and
wiring.
• Check resistance
characteristics of TF
sensor.
• Check for failure in indoor
P.C. board.
• Check connection of TS1/
TS3 sensor connector
• Check resistance
characteristics of TS1/TS3
sensor.
• The attachment check of
TS3 sensor.
• Check for failure in indoor
P.C. board.
• Failure in IPM built-in
temperature sensor
→ Replace Compressor
P.C. board.
• Check installation of
TE1 and TL1 sensors.
• Check resistance
characteristics of TE1 and
TL1 sensors.
• Check for outdoor P.C.
board (I/F) trouble
• Check connection of high-
pressure Pd sensor
connector.
• Check connection of low-
pressure Ps sensor
connector.
• Check for failure in
pressure sensors Pd and
Ps.
• Check for trouble in
outdoor P.C. board (I/F).
• Check for deficiency in
compressive output of
compressor.
• Check for connection
trouble involving Ps sensor
and Pd sensor connectors.
• Check connection of Ps
sensor connector.
• Check for failure in Ps
sensor.
• Check for deficiency in
compressive output of
compressor.
• Check for failure in 4-way
valve.
• Check for failure in outdoor
P.C. board (I/F).
• Check for failure in SV4
circuit.
• Check connection of Pd
sensor connector.
• Check for failure in Pd
sensor.
• Check for failure in outdoor
P.C. board (I/F).
• Check for failure in indoor
P.C. board (trouble
EEPROM)
• Check power supply
voltage.
• Check power supply noise.
• Check for failure in outdoor
P.C. board (I/F).