Toshiba MMU-AP0121MH - Manual (Page 61)

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Check code
Main
remote
controller
P17
P19
P20
Outdoor 7-segment display
Check code
P17
P19
P20
Auxiliary code
—
Detected outdoor unit No.
—
Detected
position
I/F
I/F
I/F
Check code name
Discharge temp
TD2 error
4-way valve
operation error
High-pressure
protective operation
Status
All stop
All stop
All stop
Error detection condition
Discharge temperature (TD2)
exceeded 115°C.
When abnormal refrigerating cycle
data was detected in heating
Pd sensor detected 3.6MPa or
more.
Check item (position)
• Check full opening of outdoor service valves (gas side, liquid side).
• Check clogging of outdoor PMV (PMV1, 2).
• Check characteristics of TD2 sensor resistance value.
• Check 4-way valve error.
• Check leakage of SV42 circuit.
• Check SV4 circuit. (Miscabling and misinstallation of SV41 and SV42)
• Check leakage of SV5 valve circuit.
• Check SV6 circuit. (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.
• Error of 4-way valve error.
• Check coil error and connector connection of 4-way valve.
• Check characteristics of TS1/TE1 sensor resistance value.
• Check characteristics of Pd, Ps pressure sensor output voltage.
• Check misconnection of TE1 and TL sensors.
• 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).
• Check Pd pressure sensor error.
• Check full opening of 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 air short-circuiting in outdoor unit.
• Check clogging of SV2 circuit.
• Check outdoor P.C. board (I/F) error.
• Check indoor fan system error. (Cause of air volume decrease)
• Check valve opening of indoor PMV.
• Check miscabling of communication line between indoor and outdoor.
• Check operation error of check valve of discharge pipe.
• Check circuit of gas balance SV4 valve.
• Check mispiping of discharge gas/suction gas main pipe.
• Check operation error of check valve of discharge gas pipe.
• Check circuit of SV11 valve. (Clogging, OFF at one side only)
• Check clogging of circuit at auxiliary heat exchanger side. (Miswiring, Disconnection, Wiring missing)
• Check Flow selector unit.
Check leakage 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 circuit of SV5 valve.
• Check refrigerant overcharge.