Toshiba MMW-UP0271LQ-E - Page 60

– 60 –
Check code
Location
of
detection
Description System status
Check code detection
condition(s)
Check items (locations)
<All outdoor units in
corresponding line to be
checked>
• 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.
Low oil level
protection
I/F All stop Operating compressor
detects continuous state of
low oil level for about 2
hours.
H07 H07 —
Main
remote
controller
Outdoor 7-segment display
Check
code
Sub-code
• Check installation of TD1
sensor.
• Check connection of TD1
sensor connector and
wiring.
• Check resistance
characteristics of TD1
sensor.
• Check for failure in outdoor
P.C. board (I/F).
TD1 sensor
miswiring
(incomplete
insertion)
I/F All stop Discharge temperature of
compressor 1 (TD1) does
not increase despite
compressor being in
operation.
H05 H05 —
• Check service valves to
confirm full opening
(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.
Activation of
low-pressure
protection
I/F All stop Low-pressure Ps sensor
detects operating pressure
lower than 0.02MPa.
H06 H06 —
• Check power supply
voltage. (AC380V ± 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 ± 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
Indoor unit (including Hot Water Module)