Toshiba MMY-MUP0721HT9P-UL Service Manual page 189

Check code
Outdoor 7-segment display
Controller
Check
Sub-code
code
1∗: Compressor
1 side
2∗: Compressor
2 side
01: Compressor
1 heat sink
trouble
02: Compressor
2 heat sink
trouble
04: Heat sink
P07 P07
dewing
Detected indoor
address
P10 P10
P11 — —
P12 — —
Location
Description System status
of
detection
Compressor Heat sink All stop
P.C. board overheating
trouble
I/F Heat sink All stop
overheating
trouble
Heat sink
dewing trouble
Indoor unit Indoor overflow All stop
trouble
I/F Outdoor heat All stop
exchanger
freeze trouble
Indoor unit Indoor fan Stop of
motor trouble corresponding
unit
- 189 -
Check code detection
Check items (locations)
condition(s)
Temperature sensor built • Check outdoor fan system
into IPM (TH) is overheated. trouble.
• Check IPM and heat sink for
thermal performance for
failure installation.
(e.g. mounting screws and
thermal conductivity)
• Check for failure in
Compressor P.C. board.
(failure IPM built-in
temperature sensor (TH))
Condensation detection on • Check outdoor fan system
heat sink has occurred four trouble.
• Check IPM and heat sink
times or more in operation.
for thermal performance for
Temperature sensor built
troubled installation.
into IPM (TH) is overheated.
(e. g. mounting screws and
thermal conductivity)
• Check for failure in
compressor P.C. board.
(failure IPM built-in
temperature sensor (TH))
• Check shortage of refrigerant.
• Check outdoor service
valves.
• Check connection of TL2
sensor.
• Check resistance
characteristics of TL2 sensor.
• Check resistance
characteristics of TO sensor.
• Check malfunctions of Pd
and Ps sensors.
• Check outdoor I/F P.C.
board malfunction.
• Check PMV2 and PMV3.
• Check refrigerant
stagnation.
• Float switch operates. • Check float switch
• Float switch circuit is connector.
open-circuited or • Check operation of drain
disconnected at connector. pump.
• Check drain pump circuit.
• Check drain pipe for
clogging.
• Check for failure in indoor
P.C. board.
• Outdoor heat exchanger • Check shortage of
remaining frost detection refrigerant.
has occurred eight times • Check connection of TE1,
or more due to abnormal TE2 and TE3 sensors.
frost formation in heating • Check resistance
operation. characteristics of TE1,
TE2, and TE3 sensors.
• Check disconnection of
TS1 sensor.
• Check resistance
characteristics of TS1
sensor.
• Check outdoor I/F P.C.
board malfunction.
• Check operation of 4 way
valve.
• Check operation of outdoor
PMV (1, 2, 3).
• Check short circuit from
outlet air to inlet air.
• Motor speed • Check connection of fan
measurements connector and wiring.
continuously • Check for failure in fan
deviate from target motor.
value. • Check for failure in indoor
• Overcurrent P.C. board.
protection is • Check impact of outside air
activated. treatment (OA).