I noticed that there is a think blanket of ice forming in the coil fins of my Window airconditioning unit. It seems the ice is "blocking" the air coming from the fans of the AC unit so, there is less cold air coming from the unit because of the ice. What seems to be the problem??
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Re: Ice on the coil fins of my Window AC unit......
Set your unit to fan mode only, to thaw the ice, after the ice melts, look at your evaporator coil, see if its dirty, if its dirty, then you might just need a good cleaning. if the coil is clean, look at your thermostat setting. it should not be all the way cold. the compressor would run continously and it would freeze the coil. third, the refrigerant system could be partially clogged up or it lacks refrigerant. these problems initiate freezing of the coil.
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several issues can cause this problem.
1st. not enough air circulating the evaporator coil meaning dirt filters or obstruction.
2nd. low refrigerant charge.
3rd. the out side tempurature maybe to cold, some units don't funtion well in cold climites.
Hello, ice will form for one of two raesons, either low airflow or a low refrigerant charge. Start by checking the filter to make sure it is clean, then check the blower wheel and make sure it is clean. If the unit is clean then the unitnis low on refrigerant and will require a hvac tech to come out and recharge the unit.
ice forming in front (where evaporative coil is located) of your AC is caused by one of two things.
(1) low refrigerant charge
(2) low air flow over the evaporative coil
I do not think it's likely that 'low refrigerant' is your problem because generally speaking - you won't lose the refrigerant out of a window unit barring an accidental puncture, or maybe from dropping the unit or something like that.
Therefore I would suspect that you have - reduced air flow over the coil - and the most likely reason is the coil being dirty/clogged.
I would take the unit out of the window and wash it real good ( a water hose with a pressure nozzle works really good).
Be sure to let the unit 'dry out' really well before turning back on.
Note: be sure to not turn the unit upside down/or on it's side for any extended length of time.
Also - your fan motor running slower than normal could cause this - but this is a rare occurrence.
mcdevito75 here, Possibly, the filter needs cleaning / replacement, unit set to too cold. Shut A/C off, let the ice melt on it"s own DO NOT REMOVE ICE YOURSELF, those coils have the fren gas in them, when the ice is all melted restart unit, set temp. not so cold, around 60--65 degrees, and have exhaust to out. This shpoul;d help, you can always check with your local A/C repair shop, they come to the house.
three possible prolems here 1 check the evaporator coil and filter to see if they are dirty and need to be cleaned dirt gets into the coil by by-passing the filter or the filter is no longer able to contain the dirt. 2 if there is a opening in your furnace that allows air to the furnance without going through the return air vent this could be a cause 3 low on freon in which a tech will be needed to check. Also check the outside unit and see if the coils have a lot of debris on them if so you can use a garden hose to clean them but make sure to have the power off and just spray the coils nothing else. Good luck
I think the more likely problem is that the unit is slightly short of gas\ refrigerant, which is a common cause of icing up evaporator coils and this sound you describe. First check that the air filter is clean. Another cause could be the defrost sensor is faulty, but I would think not. Some ice isn't actually a bad thing, but quite common as long as it doesn't form over too much of the coil, or get too thick.
The evaporator coil that is low pressure and low temperature needs an adequate supply of heat to absorb from air passing over the fins or a thin dusting of frost will begin to form further insulating the coil from the passing air and causing more ice to form. First you have to get rid of all the ice by allowing the coil to thaw you can use a heat gun or hairdryer or lamp to speed the thawing but the fins and copper tubing are thin and easily damaged so don't use tools on the coil to remove ice. After thawed the coil needs to be cleaned with an indoor evaporator cleaner ( I also use a small shopvac and nylon brush) Then be sure that the filter is clean and the blower is functioning properly then if the suction line is still frosting you will have to verify that the size of the outdoor section is not over sized in relation to the evaporator coil and that the system is charged to meet the compressors manufactures specifications.
If the air flow is restricted or partially blocked (dirty cooling fins, filter etc), ice will form inside becaue the air stays in ithe cooling coil or fils for a long period of time.
Lack of freon will not cause Ice formation because there is not enough cooling power.