Toshiba R410A Service Manual page 134

Check code
Outdoor 7-segment display
Main
remote central control
controller Check code remote controller
Sub-code
P17 P17 —
P19 P19 Detected outdoor
unit No.
P20 P20 —
Detected Check code
Status
AI-NET
position name
bb I/F Discharge All stop Discharge temperature
temp TD2 error
8 I/F 4-way valve All stop When abnormal
operation error
22 I/F High-pressure All stop Pd sensor detected
protective
operation
Error detection
condition
• Check full opening of outdoor service valves (gas side, liquid side).
(TD2) exceeded 115°C.
• 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
refrigerating cycle data
• Check coil error and connector connection of 4-way valve.
was detected in heating
• 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.
3.6MPa or more.
• 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.
Check item (position)