Toshiba MMU-AP0074YH-E(-TR) Service Manual page 83

Check code
Outdoor 7-segment display
Main
remote
Check
controller
Sub-code
code
F08 F08 —
F10 — —
F11 — —
F12 F12 —
01: Compressor
1 side
02: Compressor
F13 —
2 side
03: Compressor
3 side
F15 F15 —
F16 F16 —
F22 F22 —
F23 F23 —
F24 F24 —
F29 — —
F31 F31 —
01: Compressor
1 side
02: Compressor
H01 H01
2 side
03: Compressor
3 side
*1 Total shutdown in case of header unit
Continued operation in case of follower unit
Location
of
Description
detection
I/F TO sensor error
Indoor unit Indoor TA sensor
error
Indoor unit Indoor TF sensor
error
I/F TS1 sensor error
IPDU TH sensor error
I/F Outdoor
temperature
sensor wiring
error (TE1, TL)
I/F Outdoor pressure
sensor wiring
error (Pd, Ps)
I/F TD3 sensor error
I/F Ps sensor error
I/F Pd sensor error
Indoor unit Other indoor error Stop of
I/F Outdoor EEPROM
error
IPDU Compressor
breakdown
Error detection
System status
condition(s)
All stop Sensor resistance is infinity
or zero (open / short circuit).
Stop of Sensor resistance is infinity
corresponding unit or zero (open / short circuit).
Stop of Sensor resistance is infinity
corresponding unit or zero (open / short circuit).
All stop Sensor resistance is infinity
or zero (open / short circuit).
All stop Sensor resistance is infinity
or zero (open / short circuit).
All stop During compressor operation
in HEAT mode, TE1
continuously provides
temperature reading higher
than indicated by TL by at
least specified margin for 3
minutes or more.
All stop Readings of high-pressure
Pd sensor and lowpressure
Ps sensor are switched.
Output voltages of both
sensors are zero.
All stop Sensor resistance is infinity
or zero. (open / short circuit)
All stop Output voltage of Ps sensor is
zero.
All stop Output voltage of Pd sensor is
zero (sensor open-circuited).
Pd > 4.15 MPa despite
compressor having been
turned off.
Indoor P.C. board does not
corresponding unit operate normally.
All stop *1 Outdoor P.C. board (I/F) does
not operate normally.
All stop Inverter current detection
circuit detects overcurrent and
shuts system down.
– 83 –
Check items (locations)
• Check connection of TO sensor
connector.
• Check resistance characteristics of
TO sensor.
• Check for defect in outdoor P.C.
board (I/F).
• Check connection of TA sensor
connector and wiring.
• Check resistance characteristics of
TA sensor.
• Check for defect in indoor P.C.
board.
• Check connection of TF sensor
connector and wiring.
• Check resistance characteristics of
TF sensor.
• Check for defect in indoor P.C.
board.
• Check connection of TS1 sensor
connector.
• Check resistance characteristics of
TS1 sensor.
• Check for defect in outdoor P.C.
board (I/F).
• Defect in IGBT built-in temperature
sensor → Replace A3-IPDU P.C.
board.
• Check installation of TE1 and TL
sensors.
• Check resistance characteristics of
TE1 and TL sensors.
• Check for outdoor P.C. board (I/F)
error.
• Check connection of highpressure
Pd sensor connector.
• Check connection of lowpressure
Ps sensor connector.
• Check for defect in pressure
sensors Pd and Ps.
• Check for error in outdoor P.C.
board (I/F).
• Check for deficiency in compressive
output of compressor.
• Check connection of TD3 sensor
connector.
• Check resistance characteristics of
TD3 sensor.
• Check for defect in outdoor P.C.
board (I/F).
• Check for connection error involving
Ps sensor and Pd sensor
connectors.
• Check connection of Ps sensor
connector.
• Check for defect in Ps sensor.
• Check for deficiency in compressive
output of compressor.
• Check for defect in 4-way valve.
• Check for defect in outdoor P.C.
board (I/F).
• Check for defect in SV4 circuit.
• Check connection of Pd sensor
connector.
• Check for defect in Pd sensor.
• Check for defect in outdoor P.C.
board (I/F).
• Check for defect in indoor P.C.
board (faulty EEPROM)
• Check power supply voltage.
• Check power supply noise.
• Check for defect in outdoor P.C.
board (I/F).
• Check power supply voltage.
(220V ± 10 %).
• Check for defect in compressor.
• Check for possible cause of
abnormal overloading.
• Check for defect in outdoor P.C.
board (A3-IPDU).