Toshiba MCY-MUG0401HSW-E Service Manual page 177

Check code
Outdoor 7-segment display
Controller
Check
Sub-code
code
H02 H02 1*
H03 H03 1*
H04 H04 —
H06 H06 —
H17 H17 1*
Detected
indoor unit
address
L02 L02
—
L03 — —
L04 L04 —
J03 — —
Location of
Description
detection
Compressor Compressor
P.C. board trouble (lockup)
Current
Compressor
detection circuit
P.C. board
trouble
Compressor
I/F case thermostat
operation
Activation of
I/F low-pressure
protection
Compressor
Compressor
trouble (Step-
P.C. board
out)
Outdoor units
model
Indoor unit
disagreement
trouble
Indoor unit
incompatible
I/F
with A2L
refrigerant
Duplicated
Indoor unit indoor header
unit
Duplicated
I/F outdoor line
address
Duplicated
Indoor unit Shut-off valve
unit
Check code detection
System status
condition(s)
Overcurrent is detected
several seconds after
All stop
startup of inverter
compressor.
Current flow of at least
specified magnitude is
All stop detected despite inverter
compressor having been
shut turned off.
Compressor case
All stop thermostat performed
protective operation.
Low-pressure Ps sensor
All stop detects operating pressure
lower than 0.02MPa.
Compressor is in step-out
All stop
condition.
In case of different outdoor
Stop of
unit (Not corresponded to
corresponding
Air to Air Heat Exchanger
unit
type)
• Indoor unit incompatible
with TU2C-LINK is
connected.
All stop
• Indoor unit incompatible
with R32 refrigerant is
connected.
Stop of
There are more than one
corresponding
header units in group.
unit
There is duplication in line
address setting for outdoor
All stop
units belonging to different
refrigerant piping systems.
More than one Shut-off
Valve unit(s) have been set
up in one refrigerant line.
176
Check items (locations)
• Check for failure in compressor.
• 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 current detection circuit
wiring.
• Check failure in outdoor P.C.
board (Compressor).
• Check compressor case
thermostat circuit. (Connector,
wiring, P.C. board)
• Check full opening of service
valve. (Gas and liquid side)
• Check outdoor PMV clogging.
• Check SV4 circuit leakage.
• Check miswiring / misinstallation
of SV4.
• Check valve open status of
indoor PMV.
• Check 4-way valve trouble.
• Check refrigerant amount
shortage.
• Check service valves to confirm
full opening (both gas and liquid
sides).
• Check outdoor PMV for clogging.
• 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.
• Check power supply voltage.
(AC220-240V ± 10%).
• Check for failure in compressor.
• Check for possible cause of
abnormal overloading.
• Check for failure in outdoor P.C.
board (compressor).
• Check outdoor unit model.
(Check whether the outdoor unit
corresponds to Air to Air Heat
Exchanger type or not.)
• Check Indoor unit model.
• Check if an indoor unit
compatible with R32 refrigerant
is connected.
• Check if remote controller of
Flow Selector unit compatible
with TU2C-LINK is connected.
• Check indoor addresses.
• Check for any change made to
remote controller connection
(group/ individual) since indoor
address setting.
• Check line addresses.
• Check indoor unit(s) - Shut-off
Valve unit(s) cable