Toshiba MMY-MUP0801HT8P-TR Service Manual page 189

Check code
Main Outdoor 7-segment display
remote
Check
Sub-code
controller
code
F16 F16 —
F23 F23 —
F24 F24 —
F29 — —
F31 F31 —
1∗: Compressor
1 side
2∗: Compressor
2 side
H01 H01
1∗: Compressor
1 side
H02 H02
2∗: Compressor
2 side
1∗: Compressor
1 side
2∗: Compressor
H03 H03
2 side
*1 Total shutdown in case of header unit
Continued operation in case of follower unit
Location
Description System status
of
detection
I/F Outdoor All stop
pressure
sensor wiring
trouble (Pd, Ps)
I/F Ps sensor All stop
trouble
I/F Pd sensor All stop
trouble
Indoor unit Other indoor Stop of
trouble corresponding
unit
I/F Outdoor All stop *1
EEPROM
trouble
Compressor Compressor All stop
P.C. board breakdown
Compressor Compressor All stop
P.C. board trouble (lockup)
MG-CTT trouble
Compressor Current All stop
P.C. board detection
circuit trouble
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Check code detection
Check items (locations)
condition(s)
Readings of high-pressure • Check connection of high-
Pd sensor and low-pressure pressure Pd sensor
Ps sensor are switched. connector.
Output voltages of both • Check connection of low-
sensors are zero. 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.
Output voltage of Ps • Check for connection
sensor is zero. 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.
Output voltage of Pd sensor • Check connection of Pd
is zero (sensor open- sensor connector.
circuited). • Check for failure in Pd
Pd > 4.15MPa despite sensor.
• Check for failure in outdoor
compressor having been
turned off. P.C. board (I/F).
Indoor P.C. board does not • Check for failure in indoor
operate normally. P.C. board (failure
EEPROM)
Outdoor P.C. board (I/F) • Check power supply
does not operate normally. voltage.
• Check power supply noise.
• Check for failure in outdoor
P.C. board (I/F).
Inverter current detection • Check power supply voltage.
circuit detects overcurrent (AC380-415V ± 10%).
and shuts system down. • Check for failure in
compressor.
• Check for possible cause
of abnormal overloading.
• Check for failure in outdoor
P.C. board (Compressor).
Overcurrent is detected • Check for failure in
several seconds after compressor.
startup of inverter
• Check power supply voltage.
compressor. (AC380-415V ± 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.
Current flow of at least
• Check current detection
specified magnitude is
circuit wiring.
detected despite inverter
• Check failure in outdoor
P.C. board (Compressor).
compressor having been
shut turned off.