Toshiba MMC-UP0151HP-E, Service Manual

Page: 141 / 295

Check code
Location
of
detection
Description System status
Check code detection
condition(s)
Check items (locations)
• 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 compressor
poor compression.
• Check for failure in 4-way
valve.
• Check for failure in outdoor
P.C. board (I/F).
• Check for failure in SV4
circuit.
Ps sensor
trouble I/F All stop Output voltage of Ps
sensor is zero.
F23 F23 —
• Check connection of Pd
sensor connector.
• Check for failure in Pd
sensor.
• Check for failure in outdoor
P.C. board (I/F).
Pd sensor
trouble I/F All stop Output voltage of Pd sensor
is zero (sensor open-
circuited).
Pd > 4.15MPa despite
compressor having been
turned off.
F24 F24 —
• Check for failure in indoor
P.C. board (failure
EEPROM)
Other indoor
trouble Indoor unit Stop of
corresponding
unit Indoor P.C. board does not
operate normally.
F29 — —
• Check power supply
voltage.
• Check power supply noise.
• Check for failure in outdoor
P.C. board (I/F).
Outdoor
EEPROM
trouble I/F All stop *1 Outdoor P.C. board (I/F)
does not operate normally.
F31 F31 —
• Check power supply
voltage.
(AC380V-415V ± 10%).
• Check for failure in
compressor.
• Check for possible cause
of abnormal overloading.
• Check for failure in outdoor
P.C. board (Compressor).
Compressor
breakdown Compressor
P.C. board 1
∗
: Compressor
1 side
2
∗
: Compressor
2 side
All stop Inverter current detection
circuit detects overcurrent
and shuts system down.
H01 H01
• Check current detection
circuit wiring.
• Check failure in outdoor
P.C. board (Compressor).
Current
detection
circuit trouble Compressor
P.C. board 1
∗
: Compressor
1 side
2
∗
: Compressor
2 side
All stop Current flow of at least
specified magnitude is
detected despite inverter
compressor having been
shut turned off.
H03 H03
• Check for failure in
compressor.
• Check power supply
voltage.
(AC380V-415V ± 10%).
• Check compressor system
wiring, particularly for open
phase.
• Check connection of
connectors/terminals on
compressor P.C. board.
• Check conductivity of case
heater.
(Check for refrigerant
problem inside
compressor.)
• Check for failure in outdoor
P.C. board (Compressor).
• Check outdoor MG-CTT.
Compressor
trouble (lockup)
MG-CTT trouble Compressor
P.C. board 1
∗
: Compressor
1 side
2
∗
: Compressor
2 side
All stop Overcurrent is detected
several seconds after
startup of inverter
compressor.
H02 H02
*1 Total shutdown in case of header unit
Continued operation in case of follower unit
Main
remote
controller
Outdoor 7-segment display
Check
code
Sub-code
• 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 compressor
poor compression.
Outdoor
pressure
sensor wiring
trouble (Pd, Ps) I/F All stop Readings of high-pressure
Pd sensor and low-pressure
Ps sensor are switched.
Output voltages of both
sensors are zero.
F16 F16 —
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