Toshiba RAS-10YKV-E Block distinction, Cause of operation, Remarks, Judgment and action, status

Block distinction			Operation of diagnosis function
Check	Block	Check	Cause of operation	Air	Remarks	Judgment and action
				conditioner
code		code
				status
	Outdoor		Inverter over-current	All off	Displayed when	Even if trying operation again, all
	P.C. board		protective circuit		error is detected.	operations stop immediately. : Replace
			operates. (Short time)			P.C. board.
			Position-detect circuit	All off	Displayed when	1. Even if connecting lead wire of
			error or short-circuit		error is detected.	compressor is removed, position-
			between windings of			detect circuit error occurred. :
			compressor			Replace P.C. board.
						2. Measure resistance between wires
						of compressor, and perform short-
						circuit. : Replace compressor.
			Current-detect circuit	All off	Displayed when	Even if trying operation again, all
			error		error is detected.	operations stop immediately. :
						Replace P.C. board.
			Being out of place,	All off	Displayed when	1. Check outdoor temp. sensors
			disconnection or short-		error is detected.	(TE, TS).
			circuit of outdoor temp.			2. Check P.C. board.
			sensor
			Disconnection or short-	All off	Displayed when	1. Check discharge temp. sensor (TD).
			circuit of discharge temp.		error is detected.	2. Check P.C. board
			sensor
			Outdoor fan drive system	All off	Displayed when	Position-detect error, over-current
			error		error is detected.	protective operation of outdoor fan
						drive system, fan lock, etc. :
						Replace P.C. board or fan motor.
	Not		Outdoor heat exchanger	Operation		1. Check outdoor heat exchanger temp.
	displayed		temp. sensor error	continues	——	sensor (TE).
						2. Check P.C. board.
	Outdoor		Compressor drive output	All off	Displayed when	When 20 seconds passed after start-
	P.C. board		error, Compressor error		error is detected.	up, position-detect circuit error
			(lock, missing, etc.),			occurred. : Replace compressor.
			Break down
	Others		Return serial signal has	Operation	Flashes when	1. Repeat Start and Stop with interval
	(including		been sent when	continues	trouble is detected	of approx. 10 to 40 minutes. (Code is
	compressor)		operation started, but it		on Return serial	not displayed during operation.)
			is not sent from halfway.		signal, and normal	Supply gas. (Check also gas leak).
			(1) Compressor thermo.		status when signal	2. Unit operates normally during check.
			operation		is reset.	If Return serial signal does not stop
			Gas shortage			between indoor terminal block 2 and
			Gas leak			3, replace inverter P.C. board.
			(2) Instantaneous power			If signal stops between indoor
			failure			terminal block 2 and 3, replace
						indoor P.C. board.
			Compressor does not	All off	Displayed when	1. Trouble on compressor
			rotate.		error is detected.	2. Trouble on wiring of compressor
			(Current protective			(Missed phase)
			circuit does not operate
			when a specified time
			passed after compressor
			had been activated.)
			Discharge temp.	All off	Displayed when	1. Check dischage temp. sensor (TD).
			exceeded 117°C		error is detected.	2. Degassing
						3. Trouble on P.M.V.
			Break down of	All off	Displayed when	1. Check power voltage.
			compressor		error is detected.	(220–30–40 V+10%)
						2. Overload operation of refrigeration
						cycle
						Check installation condition
						(Short-circuit of outdoor diffuser).
			Four-way valve inverse	Operation		1. Check four-valve operation.
			error	continues
			(TC sensor value		——
			lowered during heating
			operation.)

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