Toshiba MMY-MUP0721HT9P-UL Service Manual page 185

Check code
Outdoor 7-segment display
Controller
Check
Sub-code
code
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
H05 H05 —
H06 H06 —
H07 H07 —
Location
Description System status
of
detection
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
I/F TD1 sensor All stop
miswiring
(incomplete
insertion)
I/F Activation of All stop
low-pressure
protection
I/F Low oil level All stop
protection
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Check code detection
Check items (locations)
condition(s)
Inverter current detection • Check power supply
circuit detects overcurrent voltage. (208-230V ± 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 compressor system
compressor. 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.)
Current flow of at least • Check current detection
specified magnitude is circuit wiring.
detected despite inverter • Check failure in outdoor
compressor having been P.C. board (Compressor).
shut turned off.
Discharge temperature of • Check installation of TD1
compressor 1 (TD1) does sensor.
not increase despite • Check connection of TD1
compressor being in sensor connector and
operation. wiring.
• Check resistance
characteristics of TD1
sensor.
• Check for failure in outdoor
P.C. board (I/F).
Low-pressure Ps sensor • Check service valves to
detects operating pressure confirm full opening
lower than 0.02MPa. (both gas and liquid sides).
• Check outdoor PMVs for
clogging (PMV1, 2, 3).
• Check for failure in SV4
circuits.
• Check for failure in low-
pressure Ps sensor.
• Check indoor filter for
clogging.
• Check valve opening
status of indoor PMV.
• Check refrigerant piping for
clogging.
• Check operation of outdoor
fan (during heating).
• Check for insufficiency in
refrigerant quantity.
Operating compressor <All outdoor units in
detects continuous state of corresponding line to be
low oil level for about 2 checked>
hours. • Check connection and
installation of TK1 and TK2
sensors.
• Check resistance
characteristics of TK1 and
TK2 sensors.
• Check for gas or oil leak in
same line.
• Check for refrigerant
problem inside compressor
casing.
• Check SV3D, SV3F valves
for failure.
• Check oil return circuit of
oil separator for clogging.
• Check oil equalizing circuit
for clogging.