Toshiba MMU-AP0121MH - Manual (Page 59)

59
Check item (position)
• Check the lock of fan motor (AC fan).
• Check cabling.
• Check full opening of outdoor service valves (Gas side, Liquid side).
• Check clogging of outdoor PMV. (PMV1,2)
• Check characteristics of TD1 sensor resistance value.
• Check refrigerant shortage.
• Check 4-way valve error.
• Check leakage of SV41 circuit.
• Check SV4 circuit. (Miswiring and misinstallation of SV41 and SV42)
• Check leakage of SV5 circuit.
• Check leakage of SV6 circuit. (Capillary clogging, valve operation error)
• Check mispiping of discharge gas/suction gas main pipe.
• Check Flow selector unit.
Check leakage of SVD valve and SVS valve.
(Check leakage of SVDD valve and SVSS.)
Check mispiping of FS unit connecting pipe (Suction gas/Discharge gas),
wiring between FS unit and indoor unit, and connection of connectors.
Check miswiring of SVS/SVD valves.
• Check Pd pressure sensor error.
• Check full opening of outdoor service valves (Gas side, Liquid side).
• Check outdoor fan error.
• Check outdoor fan motor error.
• Check clogging of outdoor PMV. (PMV1,2)
• Check clogging of indoor/outdoor heat exchangers.
• Check short-circuiting of outdoor suction/discharge air.
• Check clogging of SV2 circuit.
• Check outdoor P.C. board (I/F) error.
• Check indoor fan system error. (Cause of air volume decrease)
• Check opening of indoor PMV.
• Check miscabling of communication line between indoor and outdoor.
• Check operation error of check valve of discharge pipe.
• Check SV4 valve circuit.
• Check SV5 valve circuit.
• Check refrigerant overcharge.
• Check mispiping of discharge gas/suction gas main pipe.
• Check circuit clogging at auxiliary heat exchanger side.
(PMV3, SV12, check valve)
• Check FS unit.
Check clogging of SVD valve and operation error.
Check wiring inside of FS unit. (SVD/SVS coil miswiring, etc.)
Check wiring between FS unit and indoor unit.
(Miswiring, Disconnection, Wiring missing)
• Check outdoor power line.
• Check outdoor P.C. board (I/F) error.
Check code
Main
remote
controller
P01
P03
P04
P05
Outdoor 7-segment display
Check code
—
P03
P04
P05
Auxiliary code
—
—
01: Compressor 1 side
02: Compressor 2 side
01: Power supply open phase
02: Power supply negative phase
Detected
position
Indoor
I/F
I/F
I/F
Check code name
Indoor fan motor error
Discharge temp TD1 error
Actuation of high-pressure
SW
Open phase negative
phase
Status
Corresponding
unit only stops.
All stop
All stop
All stop
Error detection condition
Discharge temp (TD1) exceeded 115°C.
High-pressure SW actuated.
• Open phase was detected when the
power turned on.
• Negative phase was detected when
the power turned on.