Toshiba RAV-SM800XT-E, RAV-SM560XT-E service manual Judgement and action

Table 10-2-1

		Operation of diagnostic function
							Judgement and action
Check	Block	Check	Symptom	Unit	Condition
code		code		status
	Indoor		The indoor thermo sensor (TA) is	Operation	The lamp on the	1.	Check the indoor thermo sensor (TA).
	P.C. board		defective.	continues.	indoor unit blinks	2.	Check the indoor P.C. board.
			Disconnection or short-circuit		when error is
					defected.
			The indoor heat exchanger	Operation	The lamp on the	1.	Check the indoor heat exchanger
			sensor (TC) is defective.	continues.	indoor unit blinks		sensor (TC).
			Disconnection or short-circuit		when error is	2.	Check the indoor P.C. board.
					defected.
			The indoor fan motor or its circuit	All off	The lamp on the	1.	Check the connector circuit of the
			is defective.		indoor unit blinks		indoor fan motor (CN10).
					when error is	2.	Check the indoor fan motor.
					defected.	3. Check the indoor P.C. board.
			The part other than the above	Operation	The lamp on the	1.	Check the indoor P.C. board.
			parts on the indoor P.C. board is	continues.	indoor unit blinks		(EEPROM and peripheral circuits)
			defective.		when error is
			EEPROM access error		defected.
			IOL operation	All off	The lamp on the	Overload operation of refrigerating cycle
					indoor unit blinks
					when error is
					defected.
	The block is		The variation of TC, 5 minutes	Operation	The lamp on the	1.	Check whether or not the TC sensor
	unidentifi-		after starting the compressor,	continues.	indoor unit blinks		comes off.
	able		is 2K or less.		when error is	2.	Check whether or not it is possible to
					defected.		operate the compressor and the
							outdoor fan motor.
						3.	Check gas leak.
	Cable		The serial signals can not be	Operation	The lamp on the	1.	In the case of the outdoor unit not
	connection		transmitted and received between	continues.	indoor unit blinks		operating at all;
			indoor and outdoor units.		when error is		• Check the crossover cable and
			• The crossover wire is		defected.		connect it properly.
			connected wrongly.				• Check the outdoor P.C. board.
			• The serial signal transmitting			2.	In the case of the outdoor unit operating
			circuit on the outdoor P.C. board				normally;
			is defective.				• Check whether or not both of serial
			• The serial signal receiving				LED (Green) and serial LED (Orange)
			circuit on the indoor P.C. board				is blinking.
			is defective.				If the serial LED (Green) is not
							blinking, check the outdoor P.C. board.
							If the serial LED (Orange) is not
							blinking, check the indoor P.C. board.
			The operation command signals	Operation	The lamp on the	If the operation command signals continue
			are not transmitted from the	continues.	indoor unit blinks	to be transmitted between 2 and 3 of the
			indoor unit to the outdoor unit.		when error is	indoor terminal block, replace the outdoor
					defected. And it	P.C. board.
					returns to the
					normal condition
					when recovering
					from errors.
	Outdoor		The outdoor thermo sensor (TE)	All off	The lamp on the	1.	Check the outdoor thermo sensor (TE).
	P.C. board		is defective.		indoor unit blinks	2.	Check the outdoor P.C. board.
			Disconnection or short-circuit		when error is
					defected.
			The outdoor heat exchanger (TD)	All off	The lamp on the	1.	Check the outdoor heat exchanger
			sensor is defective.		indoor unit blinks		sensor (TD).
			Disconnection or short-circuit		when error is	2.	Check the outdoor P.C. board.
					defected.
	Other parts		The reply serial signal has been	Operation	The lamp on the	1.	Repeatedly turn the indoor unit on and
	(including		transmitted when starting the	continues.	indoor unit blinks		off with the interval of approx. 10 to 40
	compressor)		unit, but stops being transmitted		when error is		minutes. (The check code is not
			shortly after.		defected. And it		indicated during operation.) And supply
			1. Compressor thermo operation		returns to the		gas. (Check gas leak.)
			• Gas shortage		normal condition	2.	The indoor unit operates normally
			• Gas leak		when recovering		during the check.
			2. Instantaneous power failure		from errors.		If the reply serial signal continues to be
							transmitted between 2 and 3 of the
							indoor terminal block, replace the
							outdoor P.C. board.
							If the signal stops between them,
							replace the indoor P.C. board.
			The discharge temperature is	All off	The lamp on the	1.	Check the heat exchanger sensor (TD).
			over 120°C.		indoor unit blinks	2.	Gas purging
					when error is
					defected.
			The IOL operation is defective.	All off	The lamp on the	When turning on the unit, the normal
					indoor unit blinks	phase (RST) is detected but T-R waveform
					when error is	has not been detected for 120 seconds or
					detected.	more.

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