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When in heat mode on v. cold mornings my Intertherm DT3BA ices up and the only way to de-ice it is to put it on cool. But why does it do it? Freezing cold in Florida **** Jeffs

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This is generaly because they are low on freon
if it is a window model have it replaced
if it is a central system have a tecnition fill it

Posted on Jan 22, 2009

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Posted on Jan 02, 2017

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I just replaced my automatic ice maker in my Samsung french door refrigerator. Now the temperature is not cold enough to freeze the water which leaves the ice bucket with water not ice. Freezer works


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Dec 20, 2015 | Refrigerators

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

Soft serve machine freezing solid


POSSIBLE CAUSES• Mix hopper is empty, freezing cylinder starved for mix.• Mix in hopper contains ice particles, mix feed tube clogged.• Machine turned too cold

ACTION REQUIRED• Add mix to hopper. Put machine in wash mode to help thaw freezing cylinder.• Pull mix feed tube to fill freezing cylinder. Replace mix feed tube and put machine in wash mode to help thaw mix in freezing cylinder.• Follow manufacturer's recommendation for the proper temperature for the mix being used.

Apr 12, 2013 | Ice Cream Makers

1 Answer

GE refrigerator / Freezer - Erratic freezing


Do you see any ice buildup on the back wall of the freezer or behind it?

Oct 22, 2012 | GE Refrigerators

1 Answer

Installed 18000 btu split system heat pump and condensing unit is freezing up in cold weather 15 degrees out side air.


Actuall, out door fan sucks fresh air to cool the condensor when it's on "Cool" mode. If it is in " Heat mode' if the fan should run only on pressure build up. May be pressure switch is faulty.
Melt the ice with Torch gun, and check again.

Dec 15, 2010 | LG Heating & Cooling

1 Answer

Intertherm heatpump outside fan will not come on, replace fan motor and capacitor, fan will not come on what could it be


some times heat pumps have a fan cycling switch to keep the head pressure normal in cool weather or check the defrost relay for the fan when a heat pump condenser gets frosted it will stop the fan and reverse into cooling mode for a few min. to melt the ice and this function is done by a relay or a printed circuit board if it goes bad you wont have voltage to the fan

Sep 30, 2010 | Intertherm P3RA-060K Air Conditioner

2 Answers

Outside unit iced up how do de-ice


As with the simplest way to thaw ice is with heat.

If you are running this unit in cooling and have ice outside, then you most likely have a freeze up inside as well. If this is a heat pump unit, then frost is normal during operation, however, ice build-up is an indication of a problem.

There are 2 effective ways to remove the ice build-up. The first is the simplest. Get your water hose and hose it down. Be sure to turn off the breakers to the unit and avoid spraying the electrical compartment. If you have the ability to hook the hose into a hot water line, then this process with be extremely fast. Let the unit sit for about 20 minutes to dry out and turn it back on.


The second can be a little more complicated if your not tech savoy. You can turn the system on in the cooling mode. This will make the outdoor coil the condenser section. Then, either block the airflow through the coils with an object, put an object over the fan to increase pressure, or if you can, disconnect the fan so it does not run. This method is essentially the same as a defrost cycle.

As with any failure, you can fix the problem at hand, but it will return. After you get past this, your real challenge will be determining what caused the freeze-up.


If you were running your system in cooling already, then you will need to ensure the system has de-iced on the inside as well.

Jan 12, 2010 | Heating & Cooling

1 Answer

I have a 20 year old Trane heat pump. Outside


Yes, you will want to put the unit into cooling mode to help assistance with the ice melt.

If you can, block off the outdoor coil or disconnect the outdoor fan motor. This will assist in raising the discharge pressure and temperature and thus, it will melt the ice quicker.


Or, if you have the capability, you can take a garden hose around to the unit hooked into hot water and melt the ice that way.




If your control board is messed up, why aren't you replacing it?

Jan 10, 2010 | Carrier XHB123D X/Y Series Heat/Cool Air...

2 Answers

Not cooling or freezing


bimetal switch not working. change it.

Aug 02, 2009 | GE (PSS26MSRSS) Side by Side Refrigerator

1 Answer

The Icemaker is not working


When the door was open thawing and freezing occurred and your ice maker is now frozen up. there may even be ice in the water line feeding the ice maker.

Empty the entire side by side and unplug it for 24 hours with both doors open. This will solve your problem.

Your cold and frozen food will have to be stored elsewhere during this process so nothing spoils.

May 28, 2009 | GE GSS22JERBB 34" 21.9 Cu. Ft....

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