We have a goldstar 10000BTU window air conditioner. It works great most days...But if it is left on for long periods of time the inside ices up, and it won't blow cold air anymore....Why is it icing up??
Dirty coils (i'm sure you already cleaned the filter ). The coils over time (Behind the filter) get some dust and dirt trapped in between the fins and restrict air flow causing icing for the coils. Do not wipe the fins as they will bend over restricting air floe and you may ruin the unit. You should clean the coil with degreaser (Detergent type) and you usually have to take it out of the window and take it out of the metal cabinet to wash the coils.
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Sounds like you're using it when the outside temp is cooler than the inside temp. when this happens, frost will build up on the condensor. Turn the unit off until the ice melts off with a shim under the unit tilting it back towards the outside of the window to drain. If it continues to drip after melting all the ice off and letting it dry out, you have a small leak in the condensor, (unit must be old or worn out) that the freon pressure has leaked out causing it to condensate more. A good checklist would be to check the level of the unit, make sure the coils are clean and not bent, the age of the unit and for small areas of corrosion or white marks on the condensor before replacing it.
mcdevito75 here YES IT DOES, I'm no expert but that ice is the problem, remove the cover and filter and let the ice melt, DO NOT REMOVE THE ICE YOURSELF, YOU CAN HURT THE UNIT, let the ice melt, then doulble chech the unit is not set to low in temperature about 60 degrees is plenty or mid way thru the blue sign on the dial, also clean the filter.
the bottom of the case from the outside usually has a "divot" in it below the coil to allow flow from the hose that runs across the bottom of the unit, try pressuring up and "blowing out" any obstruction, if this does not work then you may have to disassemble the unit and verify the drainpan is not cracked below the indoor coil (rare)
take ac cage off or ac out of window so insides are exposed take out side and use water hose and clean out side coils and in side coils dont bend these coils or u will be sorry,,,clean out good if not stoped up have freon put in
F1, F2, and F3 are the strength of the fan blowing the air conditioner. F1 circulates the least amount of air, F3 the most. I generally find that if the air conditioner isn't getting the job done on F1, F2 will do it. I typically only use F3 if I just want to circulate air fast in my place for awhile. As far as what is "better" with closed vent or open, that depends on what you want to do. If you are using air conditioning on a hot day, then vent closed is better because it will cool only air circulating in your place. Vent open will allow fresh air in from outside, and if it's a really hot day, the air conditioner might have a harder time cooling off the fresh air than the circulating air inside your place (as it's continually being cooled repeatedly by your air conditioner).
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.