Toshiba MMU-AP0091H service manual 133, Heating

• Check outdoor PMV clogging (PMV1, 2).

• Check characteristics of TD1, TD2 sensor resistance value.

• Check indoor air filter clogging.

• Check pipe clogging.

• Check SV4 circuit (Valve leakage, misinstallation)

• 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.

Discharge temperature TD1 or TD2 was continuously 108°C or higher for 10 minutes.

• 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 refrigerant shortage.

In heating operation: 40°C or higher

• Check leakage of SV5 circuit.

• Check mispiping of discharge gas/suction gas main pipe.

In cooling operation: 60°C or higher

• Check 4-way valve error.

• Check leakage of SV4 circuit.

TS error judgment standard temperature

• Check characteristics of TS1 sensor resistance value.

• Check outdoor PMV clogging (PMV1, 2).

• Check full open of outdoor service valves (gas side, liquid side).

• Check refrigerant shortage.

• Check TS1, TS2 sensor error.

• Check capillary clogging of oil return circuit from oil separator.

• Check outdoor P.C. board (I/F) error.

• Check clogging of 4-way valve error circuit.

Check item (position)

• Check Pd and Ps sensor error.

• Check full close operation of outdoor PMV (1, 2).

• Check indoor type code (DN=10) and the capacity code (DN=11).

• Check influence of outside air control.

• Check indoor P.C. board error.

• Check fan motor error.

• Check connection of fan connector and wiring.

• Check indoor P.C. board error.

• Check clogging of drain pipe.

• Check the drain pump circuit.

• Check operation of drain pump unit.

• Check the float switch connector.

• Check IPDU error.(IGBT built-in temp sensor (TH) error).

• Check fixation between IGBT and heat sink. (Check screwing and contact.)

• Check clogging of heat sink cooling duct.

• Check outdoor fan system error.

• Check power voltage.

			Check code
					Detected	Check code
	Main	Outdoor 7-segment display		AI-NET			Status	Error detection condition
					position	name
	remote			central control
	controller	Check code	Sub-code	remote controller
	P07	P07	01: Compressor	1C	IPDU	Heat sink	All stop	IGBT built-in temp sensor (TH)
			1 side		I/F	overheat error		was overheated.
			02: Compressor
			2 side
	P10	P10	Indoor address	Ob	Indoor	Indoor	All stop	• Float switch operated.
			with trouble			overflow error		• Float switch circuit
								disconnected or the
								connector came off.
	P12	—	—	11	Indoor	Indoor fan	Corresponding	• The value of motor speed
						motor error	unit only stops.	deviated from target value
								was detected for certain time.
	The standard ducted unit air conditioner utilizes a direct current (DC) indoor fan motor that features current
								• Over-current protection
	limiting protection. In the event power is not isolated prior to service, the protective control circuit will activate							operated.
	and stop the unit operating.The check code “P12”will be displayed on the remote controller-once service work
	has been completed, this code can be cleared by switching off then on the electrical isolation device of the
	indoor unit and pressing the operation stop button on the remote controller to reset the system
	P13	P13	—	47	I/F	Outdoor liquid	All stop	In heating
						back		While the system is operating
						detection		in HEAT mode, outdoor PMV of • Check clogging of SV2 circuit.
133						error		which opening degree was 100
								pulse or less for a certain time.
	P15	P15	01: TS condition	AE	I/F	Gas leak	All stop	Suction temp exceeded the
						detection		judgment standard temp for 10
						(TS1		minutes or more.
						condition)

02: TD condition

AE

I/F

Gas leak detection (TD condition)

All stop