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Air con i did clean the air filter but ice still forms on the coil.

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Please read THIS article. It gives all possible reasons for this issue. There are quite a few procedures there, all of which I cannot post here.

Posted on May 24, 2008

  • Swilin Sampson
    Swilin Sampson May 24, 2008

    Why a fixya to the other chap? Low refrigerant is NOT the answer. If the refrigerant was low, there would be no cooling, and hence no ice build up. The problem is with the airflow.

  • Swilin Sampson
    Swilin Sampson Jun 01, 2008


    This thread has gone 7 days or more without a response.
    Please close the thread with a “FixYa” or “Helpful” rating.

    Or post back with latest developments, what steps you took,
    etc. and I will assist you further as best I can.

    Thank you.




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Ice forms around the coils of the air condition

Check to make sure that the filter is clean and make sure that the coil is clean and free of debris. A low refrigerant charge can also cause this problem.

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My window air conditioner isnt cooling like it used to. i cleaned the air filter and it still didnt fix. But it spits out ice.

Hello, ice will form on the unit either due to a dirty evaporator coil or a low refrigerant charge. Try cleaning the evaporator coil first with a coil cleaner that sprays on. If this does not help than the unt is low on refrigerant and will need to be revharged.

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The top and bottom coils ice up and there is no cold air. i'm not sure of the model #. what causes that and how to fix it?

Hello, the coil will freeze either due to low airflow or a low refrigerant charge. Many times a dirty air filter or dirty evaporator coil will cause ice to form and cleaning both will fix the problem, however if the unit appears clean then a low refrigerant charge is the problem and the unit will need to be recharged.

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On cool will work for a short time. then will stop regardless of room temperature. If stopped for a short while then restarted will begin to spit water or ice.

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Problem due to weak capacitor of indoor fan motor/short of gas/coil & air filter dust blocked.
Replace fan capacitor/if short of gas, tap up some gas/clean coil and air filter.

Hope, it's helpful.

Feb 26, 2011 | Mitsubishi Heating & Cooling

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Air con unit has ice every whaere on the unit

Make sure all the fans are running. Check the air filters and the indoor coil to make sure it is clean. If it is still icing then get the refrigerant charge checked.

Oct 23, 2010 | Heating & Cooling

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Ice is forming on the inner part and coils

if ice is forming , then u need to turn your unit to off and when it has stopped . then turn it to fan for it to deice . after that has happen clean your filter and see if that helps you

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1.5 ton ac. It is getting cold near the outlet but cold air is not blowing out. Instead pieces of ice are sometimes coming out. How to troubleshoot?

Is the fan running? If the fan is running you should check your filter. If it isn't running then you should check the capacitor for the fan and the fan motor. Also make sure the evaporator coil is clean. If all of this is good then get the refrigerant charge checked.

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Ice is forming on coil fins

Either your coil is dirty or filter is dirty. Worst case your low on freon which would make a coil freeze.But freon doesn't evaporate if your low there must be a slow leak.

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Not cooling properly. dismounting the front panel showed formation of ice on ac tubes

ice forming on the evaporator coil (you called it ac tubes) is a common sign of 'low' air flow across the coil.

The evaporator coil will 'ice' if the air flow is restricted.

This usually happens when the filter and or coil becomes dirty.

If the filter is changed often (when dirty) then the chances of the coil becoming dirty are reduced.

In any event - you must have a 'clean' filter and a clean coil.

The filter is usually made to be 'washed out,' and the coil can be cleaned with a wrag - or brush of some sort.

The goal is to make sure the filter and coil are both clean.

Other things can cause a coil to 'ice,' but are less likely.

a) low on refrigerant - not likely because the system is 'sealed' and the chances of losing gas are remote unless it's an older AC and has been 'opened' in the past - which improves the chances of a leak.

b) a problem with the fan motor - i.e. cutting off and then back on - or - not running as fast (both will reduce the air flow) as it should because of internal problems.

c) in a room with a 'low' load - i.e. the outside temp is low and the room is cool - thus causing a low load situation. This too is not likely as most AC's are being run because it's hot in the room.

Bottom line - is I would make sure my filter and evaporator coil are both clean and unrestricted.

good luck!

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Ice forming on the top

pls. check air filter, first clean the air filter, by this time heat the evaporator coil for remove ice. After cleaning start it.

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