Toshiba MMY-MUP0721FT6P-UL Service Manual page 213

Check code
Outdoor 7-segment display
Controller
Check
Sub-code
code
01: TK1 sensor
trouble
02: TK2 sensor
trouble
H08 H08
H15 H15 —
01: TK1 oil
circuit trouble
02: TK2 oil
circuit trouble
H16 H16
1∗: Compressor
1 side
2∗: Compressor
2 side
H17 H17
1∗: Compressor
1 ide s
2∗: Compressor
2 ide s
H28 H28
Location
Description System status
of
detection
I/F Trouble in All stop
temperature
sensor for oil
level detection
All stop
I/F TD2 sensor All stop
miswiring
(incomplete
insertion)
I/F Oil level All stop
detection
circuit trouble
Compressor Compressor All stop
P.C. board trouble
(Step-out)
Compressor Compressor All stop
motor winding
P.C. board
trouble
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Check code detection
Check items (locations)
condition(s)
Sensor resistance is infinity • Check connection of TK1
or zero (open/short circuit). sensor connector.
• Check resistance
characteristics of TK1
sensor.
• Check for failure in outdoor
P.C. board (I/F).
Sensor resistance is infinity • Check connection of TK2
or zero (open/short circuit). sensor connector.
• Check resistance
characteristics of TK2
sensor.
• Check for failure in outdoor
P.C. board (I/F).
Discharge temperature of • Check installation of TD2
(TD2) does not increase sensor.
despite compressor 2 being • Check connection of TD2
in operation. sensor connector and
wiring.
• Check resistance
characteristics of TD2
sensor.
• Check for failure in outdoor
P.C. board (I/F).
No temperature change is • Check for disconnection of
detected by TK1 despite TK1 sensor.
compressor 1 having been • Check resistance
started. 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.
No temperature change is • Check for disconnection of
detected by TK2 despite TK2 sensor.
compressor 2 having been • Check resistance
started. 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.
Compressor is in step-out •
Check power supply
condition. voltage.
• Check for failure in
compressor.
• Check for possible cause
of abnormal overloading.
• Check for failure in outdoor
P.C. board (compressor).
Abnormal compressor • Check for failure in
current is detected compressor.
• Check connection of
connectors/terminals on
compressor and
compressor P.C.board
• Check winding resistance
between phases of
compressor.