Toshiba MMU-UP0071MH-UL Service Manual page 106

Check code
Main Outdoor 7-segment display
remote
Check
Sub-code
controller
code
01: TK1 oil
circuit trouble
02: TK2 oil
circuit trouble
H16 H16
1∗: Compressor
1 side
2∗: Compressor
2 side
H17 H17
Detected indoor
unit address
L02 L02
L03 — —
L04 L04 —
L05 — —
No. of priority
indoor units
L06 L06
L07 — —
L08 L08 —
L09 — —
Location
Description
of
detection
I/F Oil level
detection
circuit trouble
Compressor Compressor
P.C. board trouble
(Step-out)
Indoor unit Outdoor units
model
disagreement
trouble
Indoor unit Duplicated
indoor header
unit
I/F Duplicated
outdoor line
address
I/F Duplicated
priority indoor
unit (as
displayed on
priority indoor
unit)
I/F Duplicated
priority indoor
unit (as
displayed on
indoor unit other
than priority
indoor unit)
Indoor unit Connection of
group control
cable to
standalone
indoor unit
Indoor unit Indoor group /
addresses not
set
Indoor unit Indoor capacity
not set
Check code detection
System status
condition(s)
All stop No temperature change is
detected by TK1 despite
compressor 1 having been
started.
No temperature change is
detected by TK2 despite
compressor 2 having been
started.
All stop Compressor is in step-out
condition.
Stop of In case of different outdoor
corresponding unit (Not corresponded to
unit Air to Air Heat Exchanger
type)
Stop of There are more than one
corresponding header units in group.
unit
All stop There is duplication in line
address setting for outdoor
units belonging to different
refrigerant piping systems.
All stop More than one indoor units
have been set up as priority
indoor unit.
All stop More than one indoor units
have been set up as priority
indoor unit.
Stop of There is at least one
corresponding standalone indoor unit to
unit which group control cable is
connected.
Stop of Address setting has not
corresponding been performed for indoor
unit units.
Stop of Capacity setting has not
corresponding been performed for indoor
unit unit.
– 106 –
Check items (locations)
• Check for disconnection of
TK1 sensor.
• Check resistance
characteristics of TK1
sensor.
• Check for connection
trouble involving TK1 and
TK2 sensors
• Check for clogging in oil
equalizing circuit capillary.
• Check for refrigerant
entrapment inside
compressor.
• Check for disconnection of
TK2 sensor.
• Check resistance
characteristics of TK2
sensor.
• Check for connection
trouble involving TK1 and
TK2 sensors
• Check SV3F valve
malfunction.
• Check for clogging in oil
equalizing circuit capillary.
• Check for refrigerant
entrapment inside
compressor.
• 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 outdoor unit model.
(Check whether the
outdoor unit corresponds
to Air to Air Heat
Exchanger type or not.)
• Check indoor addresses.
• Check for any change
made to remote controller
connection (group/
individual) since indoor
address setting.
• Check line addresses.
• Check display on priority
indoor unit.
• Check displays on priority
indoor unit and outdoor
unit.
• Check indoor addresses.
• Check indoor addresses.
Note:
This code is displayed
when power is turned on
for the first time after
installation.
Set indoor capacity. (DN =
11)