Toshiba air conditioner troubleshooting

Toshiba range allows to choose an air conditioner to match any wishes and requirements. Toshiba is a serious stuff: its troubleshooting system will help to quickly and effectively discover a breakdown and determine ways of its removal. See the table below for details.

TOSHIBA RAS-M10SMUV-E air conditioner troubleshooting

ProblemsCause/Solition
If any of the following conditions occur, turn off the main power supply switch and immediately contact your dealer:• The operation lamps flash at short intervals (5 times per second) even though you have tried turning off the power supply and turning on again after 2 or 3 minutes.
• Switch operation does not work correctly.
• The main power fuse often blows out, or the circuit breaker is often activated.
• A foreign matter or water inside of the air conditioner.
• Any other unusual conditions are observed.
Inoperative• The main power switch is turned off.
• The circuit breaker is activated to cut off power supply.
• The main power fuse has blown.
• No electrical current
Does not cool well or heat well• The air inlet and/or outlet of the outdoor unit is blocked.
• Doors or windows are opened.
• The fan speed is set to low.
• The air conditioner is set in the DRY mode.
• The set temperature is too high. (In cooling operation)
• The set temperature is too low. (In heating operation)
Indoor unit or outdoor unit makes a strange noise.• When the temperature suddenly changes, the indoor or outdoor unit occasionally makes a strange noise because of expansion/ contraction of parts or change of refrigerant flow.
The room air is smelly or a bad odor comes from the air conditioner.• Smells impregnated in the walls, carpets, furniture, clothing, or furs, come out.
Outdoor unit is frosted in heating operation. Water drains from the outdoor unit.• The outdoor unit is sometimes frosted in heating operation. In such case, the unit automatically performs defrosting (for 2 to 10 minutes) for increasing of the heating efficiency.
• In defrosting operation, both the indoor and outdoor units stop air flow.
• A hiss sound is heard when flow of the refrigerant is changed for defrosting.
• Resultant water of automatic defrosting in heating operation drains from outdoor unit.
Air flow changes though the FAN button is not set to the AUTO mode.• When the temperature of the blown air drops in heating operation, the air conditioner automatically changes or stops air flow from the indoor unit not to prevent the person in the room feeling cold.
• Air flow from the indoor unit is occasionally changed in the cooling operation.
A white mist of chilled air or water is generated from the outdoor unit• The indoor unit in cooling operation or the outdoor unit in defrosting operation occasionally gives off steam.
The OPERATION indicator turns on and off.• The indicator turns on and off (once per 1 second) when power is restored after a power failure or when the power main switch is set to on. If you use the remote controller for ON -»OFF operation, the indicator does not flash.
Automatic operation of air flow louvers• When the room temperature or outdoor temperature is high during the heating operation, the vertical air flow louvers close once and then set themselves automatically to the original position setting again.
Cool, Dry, or Heat operation cannot be performed.• When the unit in other room operates previously in different mode. Fan-only operation is performed because of first-push priority control. (Cool operation and Dry operation can be concurrently performed.)

SymptomsCausesReason and Disposal
The fan speed can not be changed.• Check whether the MODE indicated on the display is “AUTO".When the automatic mode is selected, the air conditioner automatically selects the fan speed.
• Check whether the MODE indicated on the display is “DRY”.When dry operation is selected, the air conditioner automatically selects the fan speed.
The remote controller signal is not transmitted even when the ECONO. FAN button is pushed.• Check whether the ON TIMER is indicated on the display.The remote controller signal is not transmitted, because the air conditioner is off.
The TEMP, indicator does not go on. (for cooling only model)• Check whether the MODE indicated on the display is “FAN ONLY”.The temperature can not be set during fan only operation.
The indication on the display disappears after a lapse of time.• Check whether the timer operation has come to an end when the OFF TIMER is indicated on the display.The air conditioner operation stops as the set time has elapsed.
The TIMER indicators go off after a certain time has elapsed.• Check whether the timer operation has started when the ON TIMER is indicated on the display.When the time set to start the air conditioner has been reached, the air conditioner will automatically start and the appropriate indicator will go off.
No receiving tone sounds from the indoor unit even when the START/STOP button is pushed.• Check whether the signal transmitter of the remote controller is properly directed at the receiver of the indoor unit when the START/ STOP button is pushed.Direct the signal transmitter of the remote controller to the receiver of the indoor unit and then repeatedly push the START/STOP button twice.

Toshiba VN-M150HE air conditioner troubleshooting

SituationWhere to checkCauseRemedy
The motor does not run.• Lead wireThe circuit is open.• Replace the motor with a new one.
• ConnectionA connection is loose.• Connect firmly.
• (Electric board, Motor connector)
• MotorThe motor bearing is locked. The motor coil or temperature fuse is broken.• Replace the motor with a new one.
• Fan rotationThe fan is not rotating.• Remove any obstacles.
• CapacitorThe capacitor is not working properly.• Replace the capacitor with a new one.
An abnormal sound is heard from the inside.• MotorElectromagnetic sound (the motor is buzzing). The bearing is in poor condition.• Replace the motor with a new one.
• FanThe fan has not been installed properly. A foreign object has been taken in. The fan has been deformed.• Install the fan securely.
• Remove the foreign object.
• Replace the fan with a new one.
• ScrewsA screw(s) is/are loose (not tightened completely).• Tighten the screws firmly.
• FilterThe filter is clogged.• Clean the filter.
• Heat exchange elementThe heat exchange element is clogged.• Clean the heat exchange element.
The motor is not running fast enough.• CapacitorThe capacitor is not working properly.• Replace the capacitor with a new one.
• MotorThe motor bearing is not running smoothly.• Replace the motor with a new one.
The damper does not open or close.• Lead wireA connection is loose.• Connect firmly.
• Damper motorThe coil of the damper motor is broken.• Replace the damper motor with a new one.
• DamperSomething is caught on the sliding part.• Remove whatever is caught.
• Connector assemblyA connection is loose.• Replace the assembled connector with a new one.