Toshiba MMU-AP0091H 134, Check code Status Error detection Check item position, Name Condition

			Check code
					Detected	Check code	Status	Error detection	Check item (position)
	Main	Outdoor 7-segment display		AI-NET
					position	name		condition
	remote			central control
	controller	Check code	Sub-code	remote controller
	P17	P17	—	bb	I/F	Discharge	All stop	Discharge temperature	• Check full opening of outdoor service valves (gas side, liquid side).
						temp TD2 error		(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.
	P19	P19	Detected outdoor	8	I/F	4-way valve	All stop	When abnormal	• Error of 4-way valve error
			unit No.			operation 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.
134									• 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).
	P20	P20	—	22	I/F	High-pressure	All stop	Pd sensor detected	• Check Pd pressure sensor error.
						protective		3.6MPa or more.	• Check full opening of service valves (Gas side, Liquid side).
						operation			• 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.