Question about Fedders A6Q10F2B Q Chassis Room Air Conditioner

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Problem with this unit

When I turn the unit off, the motor keeps "humming", also when on, the compressor runs continually. The coils are NOT iced up. Thanks for any help you can offer.

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Re: problem with this unit

The controll board for the unit is faulty. The contacts for the compressor are stuck closed. The humming is the compressor running when the unit is off.

Posted on Sep 15, 2007

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There is a loud humming coming from outside unit, the fan is not rotating.

Your question does not include what type of system you are asking about, but the assumption is that it is a heat pump. The loud humming is the compressor running by itself while the fan is off.

This is the typical way a reasonably new heat pump operates:
There is a coil temperature sensor that initiates a defrost period to eliminate the frost/ice build up on the outdoor coil. In the defrost mode, the outdoor fan shuts off and the reversing valve in the heat pump reverses the direction of refrigerant flow to warm the outdoor coil. The same coil temperature sensor senses the temperature of the external surface of the coil and tells the defrost control when the frost is gone initiating another 'reverse cycle' to put it back into heating mode. In the heating mode, the outdoor fan runs again.

If you have the heat pump installed where snow drifts accumulate, you will have a problem extracting heat from the outdoor air, and coil frosting and freezing will be exaggerated. If you have excessive ice build up due to a defosting issue, the ice can actually stop the fan from rotating, but you would hear loud bangind and rattling for hours first as the fan blades come in contact with the ice.

If you do not have drifts, but continually have an excessive amount of ice build up, either the sensor is possibly faulty or the defrost control board is faulty. The sensor's clip could easily have been knocked loose from the coil by ice and is no longer sensing coil temperature and if so the result would be the lack of defrost initiation.

Feb 13, 2015 | Air Conditioners

1 Answer

Unit cools great but when extremly hot weather occurs it eventually freezes up.

dirty filters in the indoor unit.As the ambient temperature rises the unit will work harder and longer,its fine when its just a normal day because the evaporator coil wont have time to ice up as the compressor will cycle off before the coil freezes totally,but during extreme ambient temperatures the coil will ice up as the compressor will continue running to reach set-point causing the coil to ice up

Jan 02, 2011 | Dometic Rooftop RV Air Conditioner

1 Answer

What wrong when my aircon produces ice on its evaporator

Hi, what happens that causes ice to build up on the evaporartor coil, is a blower motor not moving enough air across the coil, a dirty evap. coil, the filter plugged on the coil, and if all of those are ok, if the unit were low on freon that would cause it to ice over. What I would recommend is cleaning the indoor coil with a spray bottle and soap, lay something down and rinse it real well. Make sure the blower motor is running up to speed, good c. f. m. coming in, and if it has a filter and it was plugged, this alone will cause the air not to blow across the coil causing this problem. These are all the steps a tech will take if you call one out, so do what you can with what I have noted. If it continues to ice up, check the control thermostat to see if it will shut the unit off and on by turning it slowly. If it continues to run and does not shut it off, the control stat is the problem. You can remove it, mark all wires and take all numbers and part to a appliance parts house and get a new one. If the stat worked ok, and it still iced up, I would have to say you have a small leak somewhere in a coil indoor or outdoor and your best bet would either be replace it accordding to age or remove it and take it to a repair shop. I believe you can clean the coils and stop this problem on your own. Please keep me posted and dont forget to rate this post, as I know you will be kind. Keep me posted for more help.
A/C. Heating Contractor.

Sep 22, 2010 | Carrier BCA101R Air Conditioner

1 Answer

The air unit is frezzing up and the air is never under 70 degress in the house! whats making it keep frezzing up?

Hi, when the unit freezes up, it is either low on freon, a plugged a/c filter, or the evaporator coil is dirty and will need to be cleaned. When the evap. coil freezes up, the blower motor can't blow air through the coil. Check the filter, and behind the filter to see if the coil is dirty, just remove the screws to excess the evap. coil on this unit. Make sure the blower motor is running up to speed also. You will know. If the coil is dirty, try and clean it the best you can and replace the filter. If it continues to ice, you will need to have the freon level checked> These are the # 1 causes of coils icing up. Please let me know how it turns out.
A/C, Heating, & Refrigeration, Contractor

Aug 17, 2010 | Intertherm P3RA-048K Air Conditioner

1 Answer

Unit runs for about 5 min the cuts off. whats the problem?

It could be many things, the most common are Low R22 refrigerant, bad fan motor, bad compressor. obstructed condenser coil, bad starting relay, bad capacitor. among other things.
To check fan motor, set unit to HI Fan Only setting and let it run for a while, check that fan did not loose speed and it is not getting too hot.
If fan is OK, then turn unit to HI Cool 60-65 degrees and see what happens. Hear if compressor kicked in or if just made a humming noise and stopped. if this happens, replace capacitor.
Keep me posted!! Rate this post!!

Aug 14, 2010 | Kenmore 72055 Air Conditioner

1 Answer

Carrier Compressor Issues?

When you shut it off and back on it slugged the compressor if you turn it off and back on before the pressures equalize between the high and low sides it will slug the compressor and it will not run should let sit for five minutes or so before restarting. The humming is either the compressor making noise usually common for the compressor to make some noise or the fan motor bearings are getting bad on the outside unit. If the unit works normal probably not much you can do till it breaks if it is the compressor it is more economical to replace the whole unit if it is just the fan motor it is worth changing. You could take an amp draw on the fan motor and the compressor to see if the are within the limits on the name plate of the outside unit.

Jan 25, 2010 | Air Conditioners

2 Answers

Air conditioner doesn't blow cold air. Continues

If the a/c fails to continue to blow cold there could be a few problems you can look for. First once you activate the system check to see if the compressor kicks in. You will hear the compressor humming . Once the a/c quits cooling go and see if the compressor is still running. If its not running its probibly gone into thermal overload (compressor overheated). If that is the case then you need to check to see if the coils are icing up if they are icing up then the problem is with 1) air flow restriction filter dirty, coils dirty simple repairs there replace filter, clean evaporator coil with a coil cleaner that can be purchased at a home repair store cleaning the condensor coil the same. 2) system is low on freon in which case the system will need to be recharged. Also, If you have a digital thermostat replace the batteries that may also be of some help. Good Luck on repairs


Aug 31, 2009 | Air Conditioners

1 Answer

Compressor comes on, works for two minutes then the compressor shuts off whilke the fan continues. I recycle power on the unit and it continues top operate in this manner. I have left it off for a few days...

Your compressor has a safety built into it called a thermal protector. If you were to feel the compressor after one of these short cycles it would be extremely hot. Your compressor is malfunctioning, and it could be several things. I will list them in order of highest possibility;
Very low on refrgerant, Extremely dirty coil Fan motor failing, not enough electricity supplied to maintain compressor(should have its own circuit not shared) motor windings to compressor failing, restriction in refrigerant line, low voltge switching problem , wWithout a multimeter and gauges the two that you can ensure are clean coils and running it on its own circuit with proper sized wiring, you can clean the coil with a house hold sprayer and mild cleaner. Good luck

Jul 15, 2009 | Amcor Portable Air Conditioner...

1 Answer

Air conditioner is frozen on the inside

I would shut it off...most A/C's never need to defrost...but I'm not 100% sure about some of the newer models....In my 35 years experience.I have never seen a defrost on anything but a freezer/refrigerator....a humming noise indicates a motor is frozen up...usually a fan your case it will be the evaporator/condenser fan motor...(your type has a double shaft..that has a fan blade for the evaporator and then another shaft upon which the condenser fan blade is attached...if this goes out it will hum...and it will definitely ice over....and these window units are never supposed to ice over...except when air is not blowing over the evaporator ..or air is not blowing over the condenser. Yes it will continue especially if the fan motor is going bad...and yes keep power to it off..or the compressor can burn out and that IS THE AIR CONDITIONER...if you lose that you may as well buy a new one as the cost of repairs will be more than a new unit.....usually....If you are lucky you can take the cover off an spin the fan blade by hand and try to start it while the blade is spinning to see if it was just stuck...but it may not restart after it stops...if it doesn't you will need a new fan motor. Also next time include the Make and Model #. thanks and good luck...than you for rating my effort...the Fang.

Apr 08, 2009 | LG Electronic Window Air Conditioner

3 Answers

Ruud heat pump

If the top of the compressor is freezing you either have low refrigerant or a restriction in the coil. Check the air filter and change if necessary. Turn the outside unit off using the outside disconnect found a few feet away from the condenser. Let the indoor unit blow air for a few hours to melt the ice off of the coil. Turn back on the outside unit and after about a half hour, you should feel the cool air from your ducts. If the cool air gets warmer over the next hour, you will need a tech to look for leaks and recharge your unit. If it continues to blow warm air even after the 3-hour wait, you have other issues. To answer your original question, on the indoor unit you will find access panels that can be removed for inspection and cleaning. They are commonly located where a 3/4" drain pipe exits the cabinet. While the unit is off, remove these panels and inspect for a buildup of debris. Good Luck!

Sep 11, 2007 | Air Conditioners

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