Toshiba MMU-AP0121MH, MMU-AP0181MH, MMU-AP0151MH When the Following Symptoms are Found, Standby

3-10. When the Following Symptoms are Found

Check the points described below before asking repair servicing.

Check again.

It is not a failure.

Symptom				Cause
Outdoor unit	• White misty cold air		• Fan of the outdoor unit stops automatically and performs defrost
	or water is out.			operation.
	• Sometimes, noise		• Solenoid valve works when defrost operation starts or finishes.
	“Pushu !” is heard.
Indoor unit	• “Swish” sound is		• When the operation has started, during the operation, or immediately
	heard sometimes.			after the operation has stopped, a sound such as water flows may be
				heard, and the operation sound may become larger for 2 or 3 minutes
				immediately after the operation has started. They are flowing sound of
				refrigerant or draining sound of dehumidifier.
	• Slight “Pishi!” sound		• This is sound generated when heat exchanger, etc. expand and
	is heard.			contract slightly due to change of temperature.
	• Discharge air smells.		•	Various smell such as one of wall, carpet, clothes, cigarette, or
				cosmetics adhere to the air conditioner.
	• The operation lamp		• Flashes when power is turned on again after power failure, or when
	flashes			power switch is turned on.
	• “STANDBY	”	• When cooling operation cannot be performed because another indoor
	indication is lit.			unit performs heating operation.
			• When the manager of the air conditioner has fixed the operation to
				COOL or HEAT, and an operation contrary to the setup operation is
				performed.
			• When fan operation stopped to prevent discharge of hot air.
	• Sound or cool air is		•	Since refrigerant is flowed temporarily to prevent stay of oil or
	output from the			refrigerant in the stand by indoor unit, sound of flowing refrigerant,
	stand by indoor unit.			“Kyururu” or “Shaa” may be heard or white steam when other indoor
				unit operates in HEAT mode, and cold air in COOL mode may be
				blow-out.
	• When power of the		• Sound is generated when the expansion valve operates when power
	air conditioner is			has been turned on.
	turned on, “Ticktock”
	sound is heard.
Operates or stops automatically.			• Is the timer “ON” or “OFF”?
Does not operate.			•	Is it a power failure?
			• Is the power switch turned off?
			• Is the power fuse or breaker blown?
			• Has the protective device operated? (The operation lamp goes on.)
			• Is the timer “ON”? (The operation lamp goes on.)
			• Are COOL and HEAT selected simultaneously? (“STANDBY		”
				indication is lit on the display column of the remote controller.)
Air is not cooled	or warmed sufficiently.		•	Is the suction port or discharge port of the outdoor unit obstructed?
			• Are any door or window open?
			•	Is the air filter clogged with dust?
	It’s strange.		•	Is discharge flap of the indoor unit set at appropriate position?
			• Is air selection set to “LOW” “MED.”, and is the operation mode set to
				“FAN”?
			• Is the setup temp. the appropriate temperature?
			• Are COOL and HEAT selected simultaneously? (“STANDBY		”
				indication is lit on the display column of the remote controller.)

When the following symptoms are found, stop the operation immediately, turn off the power switch, and contact the dealer which you have purchased the air conditioner.

•Activation of switch is unstable.

•Fuse or breaker is blown periodically.

•Foreign matters or water entered by mistake.

•When if activation cause of the protective device has been removed, the operation is not performed.

•Other unusual status occurred.

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