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OUTSIDE UNIT FROZEN UP OUT SIDE TEMP -2C AOY25RZAL SNO 009301 WONT GO ONTO AUTO DEFROST?

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Posted on Jan 02, 2017

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SOURCE: out side unit will not go into defrost cycle

most likely a bad temp sensor on the outdoor coil. you are seeing ice so its cold enough to defrost but the sensor is not seeing ice so it doesn't. usually a generic 3/8 or 1/2 clamp on sensor will fix. you can freeze the sensor with a little r22 and it should close and fall into defrost or jump it and it has to proof closed and the unit should defrost. if you jump it you may have to speed up the board to diagnose. usually jumping test pins together throws it into a 5 sec in 20 seconds out cycle. kind of like turning a 24 hour days into 24 seconds. or to protect the board you can just find the sensor pull it, replace it and watch what happens next cold night. good luck

Posted on Nov 10, 2008

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Very cold outside. The filter and operation buttons are flashing. We changed the battery in the remote. Lights continue to flash.


defrost outdoor unit, quickest way put unit onto full cooling inside and it will send hot gas to outdoor unit, once unit is clear operate as required the cause of this could be a gas issue fan motor issue.a sensor not sensing correctly and not putting unit in to defrost or infact unit is far to small for area it's serving, set temperature to a manageable temperature not all the way up to the max and see how this goes, if it persists gas charge on unit should be checked to see if there is a leak. And fan should be checked to ensure correct operation.

Jan 01, 2016 | Filter 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

Freezer temp is 21F but refrigerator temp is only 60F. Side by side GE.


unit is or may be frozen up ck the back of freezer wall and if iced up then either the heaters have failed or the main board in not controling the defrost cycle .. mm it sounds like your getting some cold so i think the heaters have failed . ..

Oct 14, 2010 | GE (PSS26MSRSS) Side by Side Refrigerator

1 Answer

I have a goodman cpk j42 -1b ac unit on the outside and a central heat and air unit inside. the ac unit come on and runs fine but when it hit the temp the thermastat clicks and the fan outside goes of but...


Hello BWOOD Check the thermostat FAN button is in AUTO position not ON position.That might be it .The relay is in the blower unit but they RARELY become frozen/welded stuck on.

Aug 30, 2010 | Heating & Cooling

1 Answer

How do i clean my fridge that is not self defrost and when did they stop making them


switch off at plug,open door and let the unit self defrost(do not use sharp objects or hot water/steam to hasten defrost)
when defrosted wipe out with clorine bleach,syringe drain hole(s) and wipe dry,the bleach smell will dissipate in about an hour,then close door,switch on and fill at least 1/2 full(any less and the unit will run very ineficiently)leave door closed as much as poss until temp is between +2c/+5c(the ideal temp)ensure all seals are clean and not perished.

Aug 06, 2010 | GE (PSS26MSRSS) Side by Side Refrigerator

1 Answer

My outside heat unit is frozen and it is 10 degrees out, will it thaw while I have it on emergency heat? How long do I keep emergency heat on?


Switching to emergency heat will not defrost the unit.

If the Heat pump is malfunctioning, continue to use the emergency heat until the unit can be repaired properly.


At ten degrees, no heat pump can keep up., but it should be automatically bringing on the heat strips as back up heat. (same thing as emergency heat, it's just automatic.)

Either the extreme cold is overloading the defrost system, due to lack of properly operating exterior temp sensors or the defrost is malfunctioning,

Feb 07, 2010 | Carrier XHB123D X/Y Series Heat/Cool Air...

1 Answer

Freezer and frige not that cold


The fridge gets its cold air from the freezer through a vent(damper) between the freezer and fridge.The fan in the freezer blows air through it. There is a flap you adjust with the fridge temp. control. Make sure it's opening and closing when you adjust the fridge temp ..
If the evaporator coils behind the back panel of the freezer are icing up because of auto defrost failure that will stop the circulation of cold air and eventually affect the freezer too.

check defrost timer, defrost heater, defrost thermostat. In most newer models the timer has been replaced by an electronic control board. If the heater and thermostat are ok it’ll be the control.

You can turn the defrost timer till it clicks and everything shuts down. The heater should now come on. If it does, replace the timer. If it doesn't, check the heater and defrost thermostat. Turn the timer again till everything starts back up to end the defrost cycle.

How to check everything
http://www.acmehowto.com/howto/appliance/refrigerator/refrigerator.php


Aug 30, 2009 | Neff K3965XO Side by Side Refrigerator

1 Answer

1997 Oldsmobile Aurora Outside Temp Gauge


the sensor is in behind the nosecone. but this should not effect the ac system . it would it the inside temp sender said that in the auto mode only. put it in defrost mode and the compressor should be on if not you have another problem (maybe low on freon)

Aug 26, 2008 | 2001 Oldsmobile Aurora

1 Answer

Frige problem


This is almost a word for word common problem. On frost free fridge freezers of this type all cooling is generated through the freezer side and is merely forced into the fridge side through airflow. Therefore if you have a problem with the fridge you have a problem with the freezer section. The most likely cause is that the coil is frozen up. We would always suggest defrosting unit overnight in case it was simply a door left ajar being the cause of the fault. If the unit then pulls the fridge temp down and it was not the door ajar then you probably have a defrost problem (heater or defrost thermostat, or defrost timer). If it fails to pull the fridge temp down on restarting then it could be the fan or part of the defrost circuit or even possible the cooling circuit. The normal outcome after defrosting is that the temp will drop in the fridge due to air circulation improved, which will probably remain cool for 2-3 weeks until the coil becomes frozen again. On either result I would contact an engineer on the 2nd failure occurrs so that the engineer can establish the exact cause. Hope this helps.

Aug 13, 2007 | Maytag MZD2768G Side by Side Refrigerator

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