Toshiba MCY-MHP0305HT-C Service Manual page 99

Check code
Location
Outdoor 7-segment display
Main
remote detection
Check
Sub-code
controller
code
IPDU
F13 F13 –
I/F
F15 F15 –
I/F
F16 F16 –
I/F
F23 F23 –
I/F
F24 F24 –
Indoor
F29 – – unit
I/F
F31 F31 –
IPDU
H01 H01 –
IPDU
H02 H02 –
of Description System status
TH sensor error All stop
Outdoor All stop
temperature
sensor wiring
error (TE, TL)
Outdoor All stop
pressure sensor
wiring error (Pd,
Ps)
Ps sensor error All stop
Pd sensor error All stop
Other indoor Stop of
error corresponding
unit
Outdoor All stop
EEPROM error
Compressor All stop
breakdown
Compressor All stop
error (lockup)
98
121
Error detection
Check items (locations)
condition(s)
Sensor resistance is zero Defect in IGBT built-in
(short circuit). temperature sensor
Replace IPDU P.C.
board.
During compressor operation Check installation of TE
in HEAT mode, TE and TL sensors.
continuously provides Check resistance
temperature reading higher characteristics of TE and
than indicated by TL by at TL sensors.
least specified margin for 3 Check for outdoor P.C.
minutes or more. board (I/F) error.
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 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 4-way valve error.
Output voltage of Ps sensor Check for connection error
is zero. 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.
Output voltage of Pd sensor Check connection of Pd
is zero (sensor open- sensor connector.
circuited). Check for defect in Pd
Pd > 4.15 MPa despite sensor.
compressor having been Check for defect in outdoor
turned off. P.C. board (I/F).
Indoor P.C. board does not Check for defect in indoor
operate normally. P.C. board (faulty
EEPROM)
Outdoor P.C. board (I/F) Check power supply
does not operate normally. voltage.
Check power supply noise.
Check for defect in outdoor
P.C. board (I/F).
Inverter current detection Check power supply voltage.
circuit detects overcurrent (AC220-240V ± 10%).
and shuts system down. Check for defect in
compressor.
Check for possible cause
of abnormal overloading.
Check for defect in outdoor
P.C. board (IPDU).
Overcurrent is detected Check for defect in
several seconds after startup compressor.
of inverter compressor. Check power supply voltage.
(AC220-240V ± 10%).
Check compressor system
wiring, particularly for open
phase.
Check connection of
connectors / terminals on
IPDU P.C. board.
Check for defect in outdoor
P.C. board (IPDU).