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I have ice on the lines coming out of my furnace, and i laso had a buildup on the outside unit aswell. My fan does not seem to be pushing the cold air through also

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If your filter is clean....you are prolly low on freon.If you call a tech out....shut your unit off a few hours before so the ice will be melted and the system can be checked properly

Posted on Aug 05, 2008

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Furnace blowing cold air


Check for stopped up filter and press reset on outside unit.will. located near Freon lines at bottom of unit

Jan 07, 2014 | Ruud Heating & Cooling

Tip

Why your unit is freezing up.


To understand why your AC or heat pump is freezing up, it helps to know how your system works.

There are 7 major parts to an AC system, 9 with a heat pump.

1 - Condenser/heat pump (The outdoor unit)
2 - Air Handler (the indoor unit unless the system is a package unit, then all is outside in one system. The air handler is usually found under the home, in an attic, or in a closet.)

In the condenser are the following major parts.

3 - Compressor
4 - Condenser coil
5 - Condenser fan
6 - (HPs only) reversing valve

In the air handler are the following major parts.

7 - Blower motor
8 - Evaporator coil
9 - (HPs only) electric heat strips

Some systems known as "dual fuel systems" use another heat source in place of the heat strips, usually a gas furnace. I will address gas furnaces in another post.

When an air conditioner is operating properly several things are taking place.

1 - The compressor is compressing or "pumping" refrigerant through the system.

2 - through changes in pressure, the refrigerant makes the evaporator coil get very cold, and the condenser coil gets very hot.

3 - The blower motor/fan circulates air across the evaporator coils, as the room temperature air (Also known as "indoor ambient") goes through the cold coil, it exits, cooled approximately 15 to 20 degrees cooler than when it entered. (In a ducted system, the blower is also the fan that circulates the air throughout the home.)

4 - The condenser fan circulates air across the condenser coils. As the outdoor air goes through the condenser coil, it removes heat from the coils that are very hot. This in turn removes heat from the refrigerant so it can run its cycle again, and through pressure changes, cool the evap coil.

5 - With a heat pump, the reversing valve reverses the flow of refrigerant in the condenser and evaporator coils.
In AC mode, the evaporator coils get cold, and the condenser coils get hot. But in heat mode, the evaporator gets very hot, and the condenser very cold.

Now, whichever coil is getting cold will freeze up if there is inadequate air flow across the coil, as the refrigerant in it is far below freezing, and there is not enough airflow to keep the humidity in the air from freezing on the coil.

Things that can cause poor airflow are,

1 - Dirty/clogged coils
2 - dirty/clogged filter (will only effect evaporator coil)
3 - Closed/blocked vents (will only effect evaporator coil)
4 - Malfunctioning or dirty fan

Low refrigerant will also cause a coil to freeze up, reduce efficiency and cause the system to run for long periods of time. Not to mention, shortening the life of the unit.

With a heat pump, in heat mode only, the condenser (outdoor) coil will routinely begin to freeze up in cold temperatures. This is due to the fact that the refrigerant is below freezing, and the cold outdoor ambient temp is not warm enough to keep the condensation in the air from freezing on the coil.

Note, a properly working AC should never freeze up.

A heat pump is equipped with defrost controls to prevent ice buildup.
Some are controlled by timers, some by temp.

When a HP is going into defrost mode, the condenser fan shuts down, the reversing valve reverses the flow of refrigerant and the once cold condenser coil now gets very hot, defrosting the coil. (Many people have said this process sounds like the unit is coming apart, or about to explode and are frightened by the "smoke" which is really just steam from melting ice that comes off the unit.)

During defrost mode, the secondary or "auxiliary" heat comes on to ensure that you are still getting warm air from the vents. (Again, this can be electric heat strips or a dual fuel system)

If you are experiencing cold air from the vents during defrost, that means your auxiliary heat is malfunctioning.

The auxiliary heat is used for three purposes.

1 - during defrost mode to maintain warm airflow (automatic)
2 - when the HP cannot maintain the set temp due to extreme outdoor temps. It comes on when the indoor temp drops several degrees below the set temp on the thermostat (automatic)
3 - For emergency heat source when the HP is not working. (Manual)

To recap....

Iced up coils?

Poor airflow
low refrigerant
Malfunctioning fan
failing defrost system


There are two things that can be done in a pinch to help de-ice frozen coils. This may get you by until the repairman can get there, or you can fix the system if you are a do-it-yourselfer.

HPs frozen outdoor coil in heat mode, not going into defrost?

Cover most of the vents, and turn the system onto cooling mode until the outdoor coil is thawed. then uncover vents and return to heat, or emergency heat. (this usually takes 15 min or less)

Frozen coils in AC mode with a heat pump?
Turn the system to heat with the thermostat on just high enough to get the system to come on. (again, usually takes 15 min or less to thaw.)

AC only, with frozen evap coils? (this can sometimes be seen frozen all the way outside to the compressor on the copper lines.)

Turn the system off, and the fan switch from "auto" to on".
This will usually defrost the coils within 1 to 2 hours.
(If your system has the furnace in line before the evap coil, turn the system to heat, and the furnace will defrost the coil within minutes.)



on Dec 25, 2008 | Carrier XHB123D X/Y Series Heat/Cool Air...

1 Answer

The furnace is running but there is no cool air. I change my filters every month and I flushed out the water lines last month.


flushing out water lines do you mean condensate line coming off the furnace that drain to the outside. is the condensing unit outside running when u have it in cooling mode. by condensing unit I mean the unit outside that has lines that run to the inside. does that turn on when u have it in cooling. the unit outside have two components that should turn on the outdoor condenser fan and a compressor.

Aug 21, 2011 | Ruud UAKA060 Air Conditioner

1 Answer

My whirlpool acq128xp0 runs great one day, then barely starts the second day, It doesnt have the air volume or cooling it use too. Just started this year. Mike


Mike, when you stated it barely starts, to what are you referring? The compressor (condenser) section has an issue when starting or the indoor fan is hard to start?

If the fan does run, and the condenser unit outside is operating and you are getting lower than usual air flow (compared to previously), you may have a dirty filter, or you may have other obstructions at the evap coil inside the furnace or air handler. It could also be the unit is freezing up and ice on the evap coil is cutting down the air flow. Chances are if the coil is freezing over, you will have two issue that cause this:

Air flow issues (dirty coil, clogged air filter, or other obstructions across the evap coil, such as a plastic bag or pet hair, dust, ect.) which will also cause the coil to freeze over.

The other issue that would cause the low air flow is ice that is a result of low refrigerant.

If the system ran fine in the past, I will rule out it may be inproperly sized. Have you recently had a fan motor replaced on the indoor unit. If so, and they under sized the fan motor, then it could be the fan is not drawing, or blowing enough air across the evaporator coil and this will cause it to freeze over.

Look for ice on the suction line (piping) which is the bigger of the two lines coming from the outside unit (condensing unit). It is also the line that has the insulation covering it. If it has ice on it, then freezing is occuring on the evaporator. If so, then airflow issues, or refrigerant levels are usually the main culprits.

The two lines (suction and liquid) running between your indoor and outdoor unit should feel the following way to the touch of your hand:

Suction should be cold and possibly sweating if exposed (in places where no insulation is present).

Liquid line (smaller line) should be warm to the touch, but not too hot, or too cool. Should feel close to the outside ambient temperature if felt by hand.

Look these issues over and let me know.

Scott

Sep 04, 2010 | Whirlpool Heating & Cooling

1 Answer

1. what are reasons why refrigerant compressor burn-out? 2. ice build up on suction line. 3. Insuffecient cooling. 4.Outdoor unit not running, but indoor is operational.


On the split system 1. Can burnout from defect, lightening, etc .. 2. Only way ice will buildup back to outside unit is LOW LOAD.. either from dirty filter, dirty coil or fan blades caked up with dirt. 3.. Poor airflow will cause the poor cooling $ Outdoor unit most likely has a low pressure switch causing the outside unit to shutoff until pressure rises.. Has this helped ?

Sep 03, 2010 | Heating & Cooling

1 Answer

The aircondition is on and blowing hot air,the fan


Have you checked your filters to make sure they are not dirty? Is the Insulated suction line starting to get
covered in ice? Is the indoore coil Iced up?

If yes, turn furnace off, try and change the filters,leave
unit off for awhile while it unthaws and try it a few hours later.

Jun 24, 2010 | Heating & Cooling

1 Answer

Air conditioner fan runs outside but won 't blow cold air in house. It's 78 in there. The unit is only 3 years old.


is any air coming out? check the fan. then the evaporator coils in the furnace plenum. see if the condensation drain is plugged. see if the coils are iced up. is the thin tubing very warm? if not, you may be low on refrigerant.

Jul 29, 2009 | Heating & Cooling

1 Answer

My home coleman ac/furnace seems to be working but no air is blowing out the vents??


If you canhere the fan running check to see if you see ice on the line going outside. If you do it is iced up . causes dirty coil,inop fan and low on gas. If unit is not ice up. Check to see if fan is running. Could be bad fan switch. also. Russ

Jul 28, 2009 | Heating & Cooling

2 Answers

My AC unit wont blow the cold air.


if the ac outside is working, but not the furnace, means there is a control problem with the furnace, check wires in the furnace, make sure there is a blower wire plugged into the contact marked cool on the control panel of the furnace

Jul 09, 2009 | Fedders A&B Chassis A1A07W2B Air...

2 Answers

Line to evaporator iced over


I am not exactly sure as to the type of unit you have. If it is a ductless split system (inside unit on the wall, never seen Lennox make one) you could be low on charge, the metering device to drop the refrigerant pressure is in the outdoor unit. If this is a whole house system, you may have a restriction in the outdoor section somewhere. If you look into the unit while it is running, try to find a filterdrier. It is a cylinder soldered into the small line. You can also see exactly where the ice starts, that is where your restriction is. Let me know what you find out.
seth

Jun 26, 2009 | Heating & Cooling

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