Toshiba MMW-AP0271LQ-E Service Manual page 50

Check code
Main Outdoor 7-segment display
remote
Check
Sub-code
controller
code
F15 F15 —
F16 F16 —
F22 F22 —
F23 F23 —
F24 F24 —
F29 — —
F31 F31 —
01: Compressor
1 side
02: Compressor
2 side
H01 H01
03: Compressor
3 side
*1 Total shutdown in case of header unit
Continued operation in case of follower unit
Location
Description
of
detection
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 All stop
I/F Pd sensor error All stop
Indoor Other indoor
unit error
I/F Outdoor
EEPROM error
IPDU Compressor
breakdown
Error detection
System status
condition(s)
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)
Output voltage of Ps sensor
is zero.
Output voltage of Pd sensor
is zero (sensor open-
circuited).
Pd > 4.15 MPa despite
compressor having been
turned off.
Stop of Indoor P.C. board does not
corresponding operate normally.
unit
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.
– 50 –
Indoor unit (including Hot Water Module)
Check items (locations)
• 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. (AC200 V ± 10 %).
• Check for defect in
compressor.
• Check for possible cause
of abnormal overloading.
• Check for defect in outdoor
P.C. board (A3-IPDU).