Toshiba MMW-AP0481CHQ-E Service Manual page 55

Check code
Outdoor 7-segment display
Main
remote
Check
controller Sub-code
code
01: TS1 sersor trouble
02: TS2 sersor trouble
F12 F12
01: TS1 sersor trouble
02: TS2 sersor trouble
F13 F13
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
I/F TS1/TS2 sensor
trouble
IPDU TH sensor trouble All stop
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
Check code detection
System status
condition(s)
All stop Sensor resistance is
infinity or zero (open/
short circuit).
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
corresponding not operate normally.
unit
All stop *1 Outdoor P.C. board (I/F)
does not operate
normally.
– 55 –
Check items (locations)
• Check connection of TS1/TS2
sensor connector
• Check resistance characteristics
of TS1/TS2 sensor.
• Check for trouble in indoor P.C.
board.
• Trouble in IPM built-in temperature
sensor
→ Replace A3-IPDU 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 defect 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 defect in PS sensor.
• Check for deficiency in
compressive output of compressor.
• Check for trouble in 4-way valve.
• Check for trouble in outdoor P.C.
board (I/F).
• Check for trouble in SV4 circuit.
• Check connection of PD sensor
connector.
• Check for trouble in PD sensor.
• Check for trouble in outdoor P.C.
board (I/F).
• Check for trouble in indoor P.C.
board (trouble EEPROM)
• Check power supply voltage.
• Check power supply noise.
• Check for trouble in outdoor P.C.
board (I/F).