Toshiba MMU-P0121H Service Manual page 47

3-6-3. Check Codes Displayed on the Remote Controller and
Outdoor Unit and Check Positions
Check Detected Check code
code position name
04 Interface Inverter
communication
alarm
08 Interface 4-way valve
reversal alarm
0b Indoor Indoor drain
overflow alarm
0C Indoor Indoor TA
sensor alarm
11 Indoor Indoor fan
motor alarm
11
(4DC)
12 Indoor Other indoor
error
14 Inverter G-Tr short-
circuit
protective
system error
Trouble detection
Cause (Position)
condition
Inverter serial Serial signal from
signal inverter interruption.
4-way valve Abnormal refrigerating
circuit cycle data was
detected in heating
operation.
Float switch • Float switch operates
continuously for 2
minutes.
• Float switch circuit
disconnected or
connector out of
place.
Indoor temp. Sensor resistance
sensor (TA) value was infinity or
zero (Open, Short
circuit).
Indoor fan motor Status that detection
circuit value of motor speed is
incorrect continuously
Indoor P.C. board Indoor P.C. board
(EEPROM/ (MCC-1361) is not
Peripheral circuit) operating correctly.
Inverter over- Instantaneous over-
current protective current was detected
circuit when inverter
compressor was
activated.
3-44
Check item (Position)
• Outdoor P.C. board (Interface, IPDU) error
• Check communication connector (CN600)
between outdoor interface and IPDU P.C.
boards.
<Check for all the outdoor units in the
identical line is necessary.>
• 4-way valve is defective.
• Check defective 4-way valve coil and
connection of connectors.
• Check characteristics of TS sensor/TE
sensor resistance value.
• Check characteristics of Pd pressure
sensor/Ps pressure sensor output voltage.
• Check power supply wiring of fixed-speed
compressor and Mg-SW error.
• Check connection of float switch connector
(CN11) (Indoor main P.C. board
(MCC-1361)).
• Check drain pump operation.
• Check drain pump circuit.
• Check for blockage of water drain pipe.
• Check failure of indoor main P.C. board
(MMC-1361).
• Check connection and wiring of TA
connector (CN04).
(Indoor main P.C. board (MCC-1361)).
• Check characteristics of TA sensor
resistance value.
• Check failure of indoor main P.C. board
(MMC-1361).
• Check connection and wiring of fan
connector (CN07, CN18).
• Check running capacitor error for indoor fan.
• Check fan motor error.
• Check indoor P.C. board error.
• Check effect of outside air process (OA).
• Check connection and wiring of fan
connector (CN33, CN34)
(Indoor motor P.C. board (MCC-1382)).
• Check connection of lead wire between
connector (CN28) of indoor main P.C.
board (MCC-1361) and connector (CN27)
of indoor motor P.C. board (MCC-1382).
• Check indoor fan motor error.
• Check failure of indoor main P.C. board
(MCC-1361).
• Check failure of indoor main P.C. board
(MCC-1382).
• Check effect of outside air process (OA).
• Check power supply voltage.
• Check noise of peripheral equipment.
• Check failure of indoor main P.C. board
(MCC-1361).
• Check power supply wiring.
• Check connection on IPDU P.C. board.
• Check reactor connection.
• Check AC fuse disconnection.
• Check cause of abnormal overload
operation.
• Check inverter compressor error and short
circuit.
• IGBT conductive check
• Check shortage of capacitor capacity.
• Check outdoor P.C. board (IPDU) error.