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My heat pump doesn't produce cold air. The compressors come on but the condenser fan doesn't. Any suggestions??? Thanks George

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A heat pump has more than just the contactor to contro the condenser fan, if it is getting power to the fan then repalce the fan and the capacior, if ther is no power it could be the defrost control sensor, or the defrost board, as the fan must shut off during the winter to provide a quicker defrost when in heating mode, hope this helps...

Posted on Jul 14, 2009

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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

When the heater is on, should the fan outside on top of the unit also be working along with the blower from the heater ? When the heater is off, cold air is comming from the vent's, can I cover the


No. This is strictly a gas package unit, not a heat pump. the condenser fan motor should NOT run when their is a call for heat from the thermostat. The condenser fan only runs with the compressor on a call for cooling. Hopefully the compressor is not running @ the same time, but if it is, it would make sense that the contactor for the compressor & condenser fan motor is stuck closed OR the low voltage cooling wires are shorted straight to a 24Volt control wire.

Jan 15, 2015 | Carrier Heating & Cooling

1 Answer

Just bought a 2 yr. old Danby DAC5209M window a/c unit that doesn't cool the air before it blows it into a room. The wiring looks brand new, it was barely dirty on the inside, anyway, I've...


Hi,

Here is a tip about troubleshooting your air conditioner...
There are many things that can cause your air conditioner not to cool...

AirConditioner Trouble - Review the Possibilities

heatman101

Jul 24, 2011 | Danby DAC5020 Air Conditioner

1 Answer

Hi, I have an amana ap125hd portable air conditioner and for some reason is doesn't produce cold air anymore. Then fan blows and the compressor kicks in, but to no avail, no cold air. I took the unit...


replace it,most likely the freon leaked out,if the compressor is running and the fan is blowing but not getting cold most likely you have a leak in the sealed system.

Jul 09, 2011 | Kitchen Ranges

1 Answer

Beverage air ucr27 was working fine when plugged in and checked one day, then few days later went to plug in to use, and it produced heat-unplugged, left for day or two, plugged in again, not making heat...


I would first check to see of the condenser fan is working and the condenser is clean. Some noisy compressor could be bad but I'd check make some checks first. Let me know if we need to go any further.

Oct 03, 2010 | Beverage-Air UCR27 Refrigerator

1 Answer

Fujitsu heatpump 13 years old is not heating room as it used to.filters are clean.i have gauges and would like to know what pressures are good and what pressures indicate low refrigerant or worn...


The refrigerant and compressor are related in cooling the room.As for heating problem the thermostat needs to be checked.
if you're used to a certain temperature of air and your heat pump is producing much cooler air, take the following steps. (Note that a heat pump may go into a defrost mode to prevent icing. When this happens, it can temporarily output cold air. Also be aware that the heat pump will have to work harder to produce heat.)

1) First be sure the thermostat is set properly. Try raising the set temperature 5 degrees F. and waiting a few minutes.

2) Be sure the room-heating registers are open.

3) Check the heat pump filter. If it's dirty, change it.

4) Be sure the auxiliary heating elements are working . 

5) Clean the coils of the outdoor condensing unit.
If still the same problem then thermostat needs to be checked and replaced.
Thanks.
 

Jun 15, 2010 | Heating & Cooling

1 Answer

Heated panel


turn your frig off as soon as possible! this is an easy fix but if it goes to long it can cause permanent damage to the compressor and then you have a huge repair bill, or a big piece of trash :(

What has happened is this:

There is a fan called the condenser fan that blows air across the compressor to keep it cool. This fan has stopped working for some reason and now the compressor is VERY hot. When this happens it stops running and you get zero cold produced.

The reason the mullion is hot is because there is tubing connected to the compressor that is run through this area for condensation prevention purposes. When the condenser fan stops working, this tubing gets much hotter than normal, and that is what you are feeling.

So, replace the condenser fan motor before the compressor gets to hot that it damages itself! If I can be of further help please let me know, good luck friend!

May 31, 2010 | Whirlpool Gold White-on-White 21.9 cu. ft....

1 Answer

Condenser fan is working but the compressor is not and no cold air is coming out. the heat pump is working.


if compressor is not working check the voltage on the terminal of compressor if ok may be over heated due to low gas or the capacitor is out.

Sep 04, 2009 | Heating & Cooling

1 Answer

Condenser fan wont come on nor will compressor I do have fan op


Thanks for your Question,
First thing to check is the breaker in the panel to see if its tripped, I would suggest turning to off, then back to on, if it trips right after you have a short, if not you will need to check your fuses at the disconnect, first, shut the breaker off to the condensor, then pull the fuses and Ohm check them, if you have no reading then one or both is bad, I would recommend replacing them both if thats the case, if they check good, then you have bigger issues with your heat pump, if these suggestions do not work let me know and I can go into more indepth proceedures with you on what to do, thanks again,
mr.grzz

Jan 25, 2009 | Rheem 81VP15S Point-of-Use Electric Water...

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