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Is the a/c blowing warm air? If the coolant is not the issue, it may not be an efficient a/c, and has frosted up inside. Turn the unit off, and let is defrost. This will take several hours, but until the ice is gone, it will not allow air to blow through.
Most likely you have a bad thermostat or very dirty coils thermostats are easy to trouble shoot just remove the knob and jump the two wires on the back of it together if it comes on you have a bad thermostat. if your coils are very dirty do what the other post said but use a cleaner such as a new bright or alki foam to aid in removing the dirt from the coils.if it is real bad you will also need to clean the blower wheel but this can be hard depending on the type of unit you have.good luck
The compressor overload switch has tripped.
Shotage of gas
A room air conditioner that doesn't cool may need to be recharged with refrigerant, but the chances are good that it simply needs to be cleaned. You can do this work yourself, which involves disassembling the unit, or you can call a professional (see Air Conditioning Service in the Yellow Pages). Before attempting the work yourself, consult your owner's manual and make sure you have the right skills and tools to handle the task. Here is what a typical owner's manual will advise: 1) Unplug the unit and remove it from the window (beware, these are heavy!). Put it where you can work on it outdoors. 2) Remove the grille and filter and unscrew the metal case. Be careful not to damage the coil's fins. 3) Wash out the filter or replace it with a new, inexpensive filter--cut-to-size foam filter fabric is available at most appliance stores. 4) Using a vacuum with a soft brush attachment, clean the inside coil's fins. 5) Then, from the fan side, spray water back through the fins (protect the wiring and motor with plastic). 6) Clean it up with a rag, making sure all drains that allow condensed water to drip away from the unit are open. Allow it to dry thoroughly. 7) While you have the unit apart, lubricate the motor according to your owner's manual instructions. 8) Then reassemble and reinstall the unit. If that doesn?t do it, clean the evaporator and condenser coils.
Its very easy.. throw u r old ac and buy new one it may help u better cooling
The outdoor unit does not work
SOURCE: air conditioner only cools sometimes
Your convergence is off. See the owners manual or call tech support to walk you through a convergence.
SOURCE: Haier air conditioner will not kick on to air
A few basic principles for air conditioner troubleshooting. For both central home air conditioner or window air conditioner,
the first thing to check is whether the unit is getting proper power.
If the unit uses 220 volt power be sure that the proper voltage is
getting to the unit. Same for 110 volt units. A voltage meter can be
used to assure that the voltage is correct.
For window air conditioning units the voltage can also be checked before and after the thermostat.
If voltage is being supplied to the thermostat but not from it then the
thermostat probably needs replaced. This is a fairly common problem.
Another place to check is the fan motor voltage. The fan on window air conditioners runs both the indoor blower and the condenser fan. If that motor fails than the compressor
may run for a short time, but will overheat and shut off. Continued
operation like this will result in compressor failure. This motor can be
economically replaced for larger window air conditioners, but for
smaller ones the cost of replacement will be more than a new unit.
Central air conditioners
for the home are more complex and there are more things that can go
wrong. As with the window air conditioner the thermostat can also be a
problem. The central air conditioner thermostat will only have 24 volts going to it. So don't look for high voltage there. Some units the voltage will be coming from the outdoor unit and others the voltage will be supplied by the indoor air handler or furnace. Most home central air conditioning will be supplied by the indoor air handler or the furnace. If the air conditioner is for cooling only the unit will usually have only two wires going to the condenser unit. Make sure that you have 24 volts across those wires.
The
next thing to check will be the indoor blower. If your thermostat is
calling for cooling then the indoor blower should be running. If there
is no air moving across the indoor cooling coil then you will soon have a big block of ice formed on the coil.
This can happen for a few reasons. The indoor blower is not working,
the air flow is restricted and not allowing air to move across the coil.
A clogged air filter would also do this. Or the outdoor condenser unit has lost the charge of refrigerant.
Finally and worst of all is when you have a complete compressor failure. Often when this happens the compressor will "lock up" or not be able to turn when power is supplied to it. Overheating or lack of lubrication are usually the main causes of compressor failure. Overheating can be caused by the outdoor coil around the compressor getting clogged with dirt, leaves, or grass. Loss of the refrigerant charge will also cause the compressor to overheat. It is the cool return gas coming back to the compressor that helps to keep it from overheating.
As
you can see there are many things that can go wrong with an air
conditioner and I have not come close to exhausting the possibilities
here. I have just touched on the most common problems in a very basic
way.
There are some basic trouble shooting things that can be done very easily. Most
problems are above out of the range of comfort for many homeowners and
professional help should be consulted before any attempt is made at
repairs. Remember also, that the release of refrigerant gases into the atmosphere is a federal offense in the US. Proper care must always be taken to minimize the release of any gases. A license is also required to handle refrigerants. Make sure that the professional you call has the proper certifications to handle refrigerants properly.
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same problem, window unit clows cold then warm air will not cool 400 sq. ft. room!
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