Toshiba MMW-UP0271LQ-E Service Manual page 60

Check code
Main Outdoor 7-segment display
remote
Check
Sub-code
controller
code
1∗: Compressor
1 side
2∗: Compressor
2 side
H01 H01
1∗: Compressor
1 side
2∗: Compressor
2 side
H02 H02
1∗: Compressor
1 side
2∗: Compressor
H03 H03
2 side
H05 H05 —
H06 H06 —
H07 H07 —
Location
Description
of
detection
Compressor Compressor
P.C. board breakdown
Compressor Compressor
P.C. board trouble (lockup)
MG-CTT trouble
Compressor Current
P.C. board detection
circuit trouble
I/F TD1 sensor
miswiring
(incomplete
insertion)
I/F Activation of
low-pressure
protection
I/F Low oil level
protection
Indoor unit (including Hot Water Module)
Check code detection
System status
condition(s)
All stop Inverter current detection
circuit detects overcurrent
and shuts system down.
All stop Overcurrent is detected
several seconds after
startup of inverter
compressor.
All stop Current flow of at least
specified magnitude is
detected despite inverter
compressor having been
shut turned off.
All stop Discharge temperature of
compressor 1 (TD1) does
not increase despite
compressor being in
operation.
All stop Low-pressure Ps sensor
detects operating pressure
lower than 0.02MPa.
All stop Operating compressor
detects continuous state of
low oil level for about 2
hours.
– 60 –
Check items (locations)
• 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).
• 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.
• Check current detection
circuit wiring.
• Check failure in outdoor
P.C. board (Compressor).
• 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).
• 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.
<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.