The causes of failure of air conditioner can be divided into three main groups: production defect, poor-quality installation and improper operation. Using the troubleshooting table, you may determine whether it is possible to fix air conditioner yourself, or whether you will need to contact the service center.

Akai AUS-12H53R150P9 air conditioner troubleshooting

Problem	Possible Solutions
Air conditioner does not operate	- Is it a power failure?
	- Has the power plug been unplugged?
	- Has the circuit breaker or fuse shut off?
	- Are there any obstacles or disturbance supply oscillators in the room to disturb the signal from remote controller?
Remote controller is not available and does not display	- Check whether the batteries in remote controller are usable.
	- Check whether the batteries are positioned correctly
Operation does not start when I/O button is pressed after operation was stopped	- This is a way to protect the air conditioner. Please wait 3 minutes and try again
After operation terminates, the vane appears not to close completely	- Stepping motor could not find the Reset point. Please restart the air conditioner and stop again
Cooling and heating effect is not good.	- Is the temperature setting appropriate?
	- Are the air filters clean?
	- Are there any obstacles blocking the inlets and outlets of the indoor and outdoor units?
	- Is Sleep mode used during the daytime?
	- Is the indoor fan speed set low?
	- Are doors and windows closed?
Air will not immediately blow out at the start of Heat mode	- Please wait as the air conditioner is warming up
If the power supply is suddenly cut off, when the power is normal again, the air conditioner will automatically resume the in same mode of operation as before the power failure	-This is called auto-restart function. (This function is only accessible for certain types of air conditioners with the function of auto-restart)
Indoor unit fan stops during heating	- The air conditioner is deicing and it takes 10 minutes at most. (It freezes when the outdoor temperature is low and humidity is high.) It automatically resumes operation about 10 minutes later
Cracking sounds can be heard	- The friction sounds are caused by expansion and contraction of front grille resulting from temperature changes
You can hear the sound of running water	- It is the sound of flowing refrigerant inside the air conditioner.
	- Sound of accumulated flowing water on the Heat-exchanger.
	- Sound of frost melting on the heat exchanger
Indoor unit makes "bush" and/or "click" sound	- Click sound is made by the switching of the fan or compressor. The "bush" sound is made by the switch of refrigerant flowing inside the air conditioner
When the unit is set to directional swinging at low angle on Cool mode: the deflector will/may auto swing to its maximum angle for 3 minutes and then resume to swing at the low angle	-This function prevents the production of condensed water. It is a normal operation for the air conditioner
Indoor unit gives odour	- Air conditioner may have absorbed odours from wall, carpet, furniture and in turn blows it out
	- Follow the Cleaning and Maintenance procedures
Outdoor unit leaks water	- During cooling, connecting pipe or pipe connector will cause the moisture content condensation due to the low temperature.
	- During heating or defrosting, melting water and water vapor will run out.
	- During heating, water on heat exchanger will drop

Akai MWF-18CRN1-QC1G air conditioner troubleshooting

PROBLEM	POSSIBLE CAUSE	REMARK
Fan motor will not run.	No power	Check voltage at electrical outlet. Correct if none.
	Power supply cord	Check voltage at the power cord terminal. Replace the power cord if none.
	Wire disconnected or connection loose	Connect wire. Refer to wiring diagram for terminal identification. Repair or replace loose terminal.
	Main switch failure	Check and replace the main switch if failure.
	Capacitor (Discharge capacitor before testing)	Test capacitor. Replace if not within +/-10% of manufacture's rating. Replace if shorted, open or damaged.
	Will not rotate	Fan blade hitting shroud or blower hitting scroll. Realign assembly. Check fan motor bearings. Replace the motor if motor shaft do not rotate.
Fan motor runs intermittently	Cycles on overload.	Check voltage. Call an electrician if not within limits.
		Test capacitor. Replace if not within +/-10% of manufacture's rating.
		Check bearings. Replace the motor if the fan blade cannot rotate freely.
		Pay attention to any change from high speed to low speed. Replace the motor if the speed does not change.
Fan motor noise.	Fan	Replace the fan if cracked, out of balance, or partially missing.
	Blower	Replace the blower if cracked, out of balance, or partially missing.
	Loose screws	Tighten them.
	Worn bearings	Replace the motor if knocking sounds continue when running or loose, or the motor hums or noise appears to be internal while running.
The compressor not to stop even the room temperature has got to the setting temperature.	Thermostat	Check and replace if the thermostat is damaged.
Insufficient cooling.	Air filter	Clean or replace if restricted.
	Vent, door	Close if open.
	Unit undersized	Determine if the unit is properly sized for the area to be cooled or heated.
	Condenser and Evaporator	Clean or replace if restricted.
	Fan motor	Check the fan capacitor and replace if not within +/-10% of manufactures rating.
	Room structure	Take proper measures to make the door and windows sealed well if gap is found.
	Air flow	Clean or remove if any barrier is found to block the inlet/outlet wind flow of the unit.
	Sunlight	Add a awning if the condenser is exposed to the sunlight.
	Less refrigerant	Check the tubes for reasons of leakage. Recycle the refrigerant, correct the leakage points and recharge.
	Capillary tube	Regulate the flow if capillary tube and make the evaporating temperature appropriate if the evaporator is frosted. Replace if blocked. Repair joint if leaking.
	Compressor	The inlet and outlet valve of the compressor is damaged, making the low pressure connected with the high pressure. The refrigerating system can not produce high pressure and low pressure. Replace the compressor after checking for the reason.
	reverse valve	The seal in valve is damaged, making the low pressure connected with the high pressure. The refrigerating system can not produce high pressure and low pressure. Replace the reverse valve after checking for the reason.
	Drainage	The drainage is blocked. It will increase the efficiency in cooling mode, but will cause the condenser to frost in heating mode.
Stop instantly after startup.	Refrigerant	The amount of the refrigerant is too much, making the compressor load too big. Recycle and recharge the refrigerant after checking for the reason.
	Compressor	The compressor is seized. Replace after checking for the reason.
No cooling or heating.	No power	Check the voltage. Call an electrician if no within the limit.
	Wiring	Check the terminals. Repair and correct if loose.
	Temperature setting	Check and adjust the thermostat.
	Main switch setting	Check and adjust the main switch setting.
	Reverse valve wire	Check the resistance of reverse valve wire. Replace the wire if short, open or damaged.
	Reverse valve	If the reverse valve is blocked, the heating mode will not perform. Replace the reverse valve after checking the reason.
Compressor will not run while fan motor runs.	Voltage	Check voltage. Call Supply Authority if not within limits.
	Wiring	Check the wire connections, if loose, repair or replace the terminal. If wires are off, refer to wiring diagram for identification, and replace. Check wire locations. If not per wiring diagram, correct.
	Main switch failure	Check and replace the main switch if failure.
	Capacitor (Discharge capacitor before testing)	Check the capacitor. Replace if not within +/-10% of manufacturers rating. Replace if shorted, open, or damaged.
	Thermostat	Check the thermostat setting if not at the coolest (in cooling mode) or the warmest (in heating mode). Set it if not.
	Compressor	Check the compressor for open circuit or ground. If open or grounded, replace the compressor.
Excessive noise.	Copper tubing	Remove the cabinet and carefully rearrange tubing not to contact cabinet, compressor, shroud and barrier.
The unit starts and stops frequently.	Power supply	The input power supply voltage is too low. Call an electrician if not within limits.
	Outdoor temperature	When the outdoor temperature is too high, the compressor will protect.