Toshiba MMU-AP0072H2UL Service Manual page 92

Check code
Outdoor 7-segment display
Main
remote
controller
Check code
F08 F08
F10 –
F11 –
F12 F12
01: Compressor 1
side
02: Compressor 2
F13 F13
side
03: Compressor 3
side
F15 F15
F16 F16
F22 F22
F23 F23
F24 F24
Location
of Description
detection
Sub-code
I/F TO sensor
error
–
Indoor Indoor TA
unit sensor error
–
Indoor Indoor TF
unit 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
–
System Error detection
status condition(s)
All stop Sensor resistance is infinity
or zero (open/short circuit).
Stop of Sensor resistance is infinity
corresponding or zero (open/short circuit).
unit
Stop of Sensor resistance is infinity
corresponding or zero (open/short circuit).
unit
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 low-
pressure 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 > 601psi (4.15MPa)
despite compressor having
been turned off.
92
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 high-
pressure Pd sensor connector.
• Check connection of low-
pressure 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).