Question about Fedders A6Y12F2D Thru-Wall/Window Air Conditioner

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Ice on the evaporator

The unit gets ice on the evaporator then the blower motor blows it in the room. The unit keeps the room cool. How do I fix it? I am a licensed a/c mechanic, but I do installations.

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Make sure the coils are not dirty,if they are not dirty,add freon to the system,not much,feel the evaporator,when the evaporator is cool all over,and the condenser is warm all over,there is enough freon,add very little at a time,this system does not hold much freon,if this was helpful,at all,please rate,thank you.

Posted on Jul 06, 2010

Testimonial: "Thank You. It worked. It turns out that leafs from the tree that the unit is under fell inside the top vents of the casing. Ths must have happened in the fall. It was blocking the air flow through the condenser as the fan turned. I did a total clean out of the unit. I cleaned both coils too. The a/c worked wonderful last night. There is no more ice on the evaporator coil. Thank you very much, Paul"


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I changed the blower to evaporator. The air temperature is cold but after 2 days the evaporator was turned into ice. The evaporator blower is not blowing some air. Is this overcharging of FREON because...

The blower is it running in the right direction? the cupped blades should be facing the outlet of the fan housing, I have done it myself. And are the coils clean could also cause the ice build up, a good pleated filter will keep the coil clean.

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thins that can cause an a/c to ice up
1 something blocking the return air to the system (dirty filter, something in front of the unit blocking the incoming air )
2 defective thermostat keeps the unit running past the desire temperature system does not cycle off and ice begins to form.
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4 defective blower fan this is will prevent the air from circulating pas coil and ice will form.


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Our window-type airconditioner never gets that cool and when we remove the front cover, its all covered in ice....what should we do ? thanks

Problem is most likely the de-icing switch, a thermostatic device which cuts of the compressor when the evaporator gets below a certain temperature -- the de-icing switch is not opening, the compressor keeps running and the unit ices over. With ice on the evaporator, air does not flow over it, and the unit does not cool the room.

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My air condition blocks some ice in the system, causing not enough cool provide.

Water leak /Icing in your evaporator is the common problem in split airconditioners.. It happens due to:

1. Air filter block 2. Evaporator coil Block. 3. Less rpm of blower motor. 4.Drain line blocked.

To rectify, service the unit completely. If blower motor less rpm, replacemotor capacitor.

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There is no cooling in my fridge but fridge is on,fan is working but no cooling

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Replace the blower motor resister,this is the speeds for the blower motor,it is located very near the blower motor,and is mounted on the blower box,and it actually goes inside the box,to keep it cool.The reason for it`s failure is the blower motor,even though the blower motor sounds,and runs good,it is drawing too many amps.If this was at all helpful,please rate,thank you.

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Our Quietmaster 's cooling works for a while and then doesn't.

Remove the front cover and make sure the temp sensing wire is in place on the front of the evaporator coils. If it has fallen and is touching the evaporator plumbing the unit can preform as you described.

Also check for signs of icing / ice build up on the evaporator coils after the uint has run for a couple of hours. Ice build up will also cause this symptom. IF you do find that the unit is icing up that can be caused by:
1. A very dirty evaporator
2.. A clogged Air filter
3. Contaminated by internal plumbing debris / clogged freon passages
4. A blower Fan motor running to slow.
5. Freon Pressure and return lines touching together usually either on the side of the unit or just behind the center chassis air wall enroute to the compressor.
6. A corroded electronic control board.

As you can see above there are several things that can cause the symptom your described. It cetainly sounds as if you either have an icing problem or a control board problem.

The next time the symptom occurs... place the unit of fan only for at least 30 minutes and then see if you can switch it to cool, and actually have it cool. If it does cool properly after switching to fan only for 30 minutes you most likely have an icing problem.

Thanks for using FixYa.


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Hi, it sounds like the evaporator coil that is located on the inside as built up with ice, and has blocked most of the air flow. What can cause this is a very dirty filter, indoor coil that's iced up, and if the filter and coil are clean, make sure the indoor blower is up to speed. Turn it off and let it defrost. It will take some time. Turn it on fan only. If all is clean and motor is fine and it continues to ice, you are low on freon, and have a small leak causing it to ice up. It is probably a very small leak that may have taken a few years to leak to this point. I would make sure the filter is clean, coil indoors is clean, and blower is up to speed. If this is all good, you will need to get it charged. This unit holds less then 2 pounds of R-22.
Keep me posted on the out come. You can pull the indoor cover and see if you have ice on it. Let me know.

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