Toshiba MMY-MUP0721HT9P-UL Service Manual page 184

Check code
Outdoor 7-segment display
Controller
Check
Sub-code
code
F11 — —
01: TS1 sensor
trouble
03: TS3 sensor
trouble
F12 F12 04: TS3 sensor
disconnect
1∗: Compressor
1 side
F13 F13
2∗: Compressor
2 side
F15 F15 —
F16 F16 —
F23 F23 —
F24 F24 —
F29 — —
F31 F31 —
*1 Total shutdown in case of header unit
Continued operation in case of follower unit
Location
Description System status
of
detection
Indoor unit Indoor TF Stop of
sensor trouble corresponding
unit
I/F TS1/TS3 All stop
sensor trouble
Compressor TH sensor All stop
P.C. board trouble
I/F Outdoor All stop
temperature
sensor wiring
trouble (TE1,
TL1)
I/F Outdoor All stop
pressure
sensor wiring
trouble (Pd, Ps)
I/F Ps sensor All stop
trouble
I/F Pd sensor All stop
trouble
Indoor unit Other indoor Stop of
trouble corresponding
unit
I/F Outdoor All stop *1
EEPROM
trouble
- 184 -
Check code detection
Check items (locations)
condition(s)
Sensor resistance is infinity • Check connection of TF
or zero (open/short circuit). sensor connector and
wiring.
• Check resistance
characteristics of TF
sensor.
• Check for failure in indoor
P.C. board.
• Sensor resistance is infinity • Check connection of TS1/
or zero (open/short circuit). TS3 sensor connector
• When TS3 detects an • Check resistance
unusual temperature characteristics of TS1/TS3
during compressor sensor.
operation and PMV4 • The attachment check of
operation in cooling mode. TS3 sensor.
• Check for failure in indoor
P.C. board.
Sensor resistance is infinity • Failure in IPM built-in
or zero (open/short circuit). temperature sensor
→ Replace Compressor
P.C. board.
During compressor • Check installation of
operation in HEAT mode, TE1 and TL1 sensors.
TL1 continuously provides • Check resistance
temperature reading higher characteristics of TE1 and
than indicated by TL1 by at TL1 sensors.
least specified margin for 3 • Check for outdoor P.C.
minutes or more. board (I/F) trouble
Readings of high-pressure • Check connection of high-
Pd sensor and low-pressure pressure Pd sensor
Ps sensor are switched. connector.
Output voltages of both • Check connection of low-
sensors are zero. pressure Ps sensor
connector.
• Check for failure in
pressure sensors Pd and
Ps.
• Check for trouble in
outdoor P.C. board (I/F).
• Check for compressor
poor compression.
Output voltage of Ps • Check for connection
sensor is zero. trouble involving Ps sensor
and Pd sensor connectors.
• Check connection of Ps
sensor connector.
• Check for failure in Ps
sensor.
• Check for compressor
poor compression.
• Check for failure in 4-way
valve.
• Check for failure in outdoor
P.C. board (I/F).
• Check for failure in SV4
circuit.
Output voltage of Pd sensor • Check connection of Pd
is zero (sensor open- sensor connector.
circuited). • Check for failure in Pd
Pd > 4.15MPa despite sensor.
compressor having been • Check for failure in outdoor
turned off. P.C. board (I/F).
Indoor P.C. board does not • Check for failure in indoor
operate normally. P.C. board (failure
EEPROM)
Outdoor P.C. board (I/F) • Check power supply
does not operate normally. voltage.
• Check power supply noise.
• Check for failure in outdoor
P.C. board (I/F).