Toshiba MMW-AP0481CHQ-E Service Manual page 58

Check code
Outdoor 7-segment display
Main
remote
Check
controller Sub-code
code
01: TK1 oil circuit trouble
02: TK2 oil circuit trouble
04: TK4 oil circuit trouble
05: TK5 oil circuit trouble
H16 H16
J03 — —
Detected indoor
address
J10 J10
—
J11 —
L02 L02 —
—
L03 —
—
L04 L04
Location
Description
of
detection
I/F Oil level detection
circuit trouble
Indoor unit Duplication of
FS units
Indoor unit FS unit overflow
trouble
Indoor unit FS unit
Temperature
sensor(TCS)
trouble
Indoor unit Outdoor units
model
disagreement
trouble
Indoor unit Duplicated indoor
header unit
I/F Duplicated
outdoor line
address
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.
No temperature change
is detected by TK4
despite compressor
having been started.
No temperature change
is detected by TK5
despite compressor
having been started.
Stop of More than one FS units
corresponding have been set up in one
unit(s) refrigirant line.
All stop • Float switch operates
• Float switch circuit is
open-circuited or
disconnected at
connector.
Stop of Sensor resistance is
corresponding infinity or zero(open/
unit(s) short circuit)
All stop In case of different
outdoor unit
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.
– 58 –
Check items (locations)
• Check for disconnection of TK1
sensor.
• Check resistance characteristics of
TK1 sensor.
• Check for connection trouble
involving TK1, TK2, TK4, and TK5
sensors
• Check for clogging in oil equalizing
circuit capillary and trouble
operation in check valve.
• Check for refrigerant entrapment
inside compressor.
• Check for disconnection of TK2
sensor.
• Check resistance characteristics of
TK2 sensor.
• Check for connection trouble
involving TK1, TK2, TK4, and TK5
sensors
• Check for clogging in oil equalizing
circuit capillary and trouble
operation in check valve.
• Check for refrigerant entrapment
inside compressor.
• Check for disconnection of TK4
sensor.
• Check resistance characteristics of
TK4 sensor.
• Check for connection trouble
involving TK1, TK2, TK4, and TK5
sensors
• Check for clogging in oil equalizing
circuit capillary and trouble
operation in check valve.
• Check for refrigerant entrapment
inside compressor.
• Check for disconnection of TK5
sensor.
• Check resistance characteristics of
TK5 sensor.
• Check for connection trouble
involving TK1, TK2, TK4, and TK5
sensors
• Check for clogging in oil equalizing
circuit capillary and trouble
operation in check valve.
• Check for refrigerant entrapment
inside compressor.
• Check indoor unit (s)-FS unit (s)
cable
• Check float switch connector
• Check operation of drain pump.
• Check drain pump circuit
• Check drain pipe for clogging
• Check for trouble indoor PC board.
• Check connection of TCS sensor
connector
• Check resistance characteristics of
TCS sensor.
• Check for trouble FS unit PC board.
• Check outdoor unit model.
• Check indoor addresses.
• Check for any change made to
remote controller connection
(group/individual) since indoor
address setting.
• Check line addresses.