Toshiba RAS-13YKV-E, RAS-10YKV-E, RAS-10YAV-E, RAS-13YAV-E service manual Block distinction

10-4-3. Caution at Servicing

(1)After servicing, push the START/STOP button to return to the normal mode.

(2)After servicing by the check code, turn off breaker of the power supply, and turn on breaker of the power supply again so that memory in the microcomputer returns the initial status. However, the check codes are not deleted even if the power supply is turned off because they are stored in the fixed memory.

			Table 10-4-1
Block distinction			Operation of diagnosis function
Check		Check		Air		Judgment and action
	Block		Cause of operation	conditioner	Remarks
code		code
				status
	Indoor P.C.		Short-circuit or	Operation	Displayed when	1. Check the room temp. sensor.
	board etc.		disconnection of the room	continues.	error is detected.	2. When the room temp. sensor is
			temperature sensor
						normal, check P.C. board.
			(TA sensor).
			Being out of place,	Operation	Displayed when	1. Check heat exchanger sensor.
			disconnection, short-	continues.	error is detected.	2. When heat exchanger sensor is
			circuit, or migration of
						normal, check P.C. board.
			heat exchanger sensor
			(TC sensor)
			Lock of indoor fan or	All off	Displayed when	1. Check P.C. board.
			trouble on the indoor fan		error is detected.	2. When P.C. board is normal, check
			circuit
						the motor.
	Not		Trouble on other indoor	Operation	Displayed when	Replace P.C. board.
	displayed		P.C. boards	continues.	error is detected.
	Connecting		Return serial signal is not	Operation	Flashes when	1. When the outdoor unit never
	cable and		sent to indoor side from	continues.	trouble is detected	operate:
	serial signal		operation started.		on Return serial	(1) Check connecting cable, and
					signal, and normal
			(1) Defective wiring of			correct if defective wiring.
					status when signal
			connecting cable
					is reset.	(2) Check 25A fuse of inverter P.C.
			(2) Operation of			board.
			compressor thermo.			(3) Check 3,15A of inverter P.C.
			Gas shortage
						board.
			Gas leak
						2. To display [Other] block during
						operation, check compressor
						thermo. operation and supply gas
						(check gas leak also).
						3. Unit operates normally during check.
						If Return serial signal does not stop
						between indoor terminal board 2 and
						3, replace inverter P.C. board.
						If signal stops between indoor
						terminal board 2 and 3, replace
						indoor P.C. board.
			Operation command	Operation	Flashes when	If Return serial signal does not stop
			signal is not sent to	continues	trouble is detected	between indoor terminal board 2 and 3,
			outdoor side.		on Operation	replace inverter P.C. board.
					command signal,	If signal stops between indoor terminal
					and normal status	board 2 and 3, replace indoor P.C.
					when signal is	board.
					reset.

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