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Freeze up evaporator freezing up circuit blew once in last month ...........otherwise great machine but havin freeze up problems now

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If the filter is not dirty then the problem is that you are low on freon. Unfortunately, it will probably cost as much or more to repair the unit as it will to replace it.

Posted on Jul 05, 2008

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Rv heat pump problems


Open circuit or out of range Freeze Sensor. Air conditioner mode of operation will be locked out. Furnace, heat strip, heat pump and fan mode of operation can continue to operate but displays the last temperature set-point. There is a sensor that detects evaporator freezing, it may be bad or your freezing because of low freon levels

Sep 30, 2013 | Dometic Rooftop RV Air Conditioner

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Coils freeze up


The first thing to do is see if the indoor (evaporator-air handler) fan and compressor are both running at the same time, then turn the unit off and let all the ice melt.
If the compressor is running and the evaporator fan isn't, you've already found the main cause of your air conditioning freezing problem.
The indoor coil will freeze up if the compressor runs without the evaporator fan running.
Check to see if ice has built up enough to stop the fan.
If it has, (and it's possible with wall mounted ductless mini split units and some window units), the fan may run normally once the ice melts, and the cause of your air conditioning freezing problem could be something else.
If you are the equipment owner trying to take care of this air conditioning freezing problem yourself, and you get to the point that you have to call in a technician, it could save him time, (which saves you money) if you have already verified whether the evaporator fan was or wasn't running with the compressor, and if ice had built up enough to stop the fan.
Once the ice has melted, check the fan or blower blades, and see if they're clean and not obstructed by something like a plastic bag, other debris, or mould growth.
Remove any obstructions, and if necessary, remove the blower and clean it.
Before tearing into the rest of the unit, check the thermostat and make sure it's working right.
Do the cool contacts open when the t-stat is turned up to a higher temp than the room temp?
If not, the thermostat has failed, and never turns the unit off, which can definitely cause an air conditioning freezing problem.
Do the fan contacts open and close when the thermostat setting is turned higher and lower than the room temperature?
If the fan contacts never close but the cool contacts do, the thermostat has failed and caused your air conditioning freezing problem.
If the fan contacts close, but the fan doesn't run, check the fan relay in the air handler.
If the fan relay is not getting control voltage, the circuit is open between the thermostat and the fan relay.
Look for a loose connection, wrong connection, dis-connection, or broken wire.
If it gets control voltage but doesn't energize, it has failed, and must be replaced.
If it energizes but the fan doesn't run, check for line voltage on the load side of the relay.
If there is line voltage on the load side of the relay and the fan doesn't run, you'll have to troubleshoot the load side circuit and the fan motor as detailed further on.
If the thermostat checks out ok, set the thermostat to "fan on" and make sure the blower runs in the correct direction and at the proper RPM, that it is installed in the housing correctly, and is the right size.
If the blower is installed backwards or is running in reverse, the coil can freeze up. (Although I have seen several units that didn't freeze up with reversed blowers.)
You will need to turn the blower around, reverse the rotation of the motor if it is a reversible rotation motor, or install a motor with the correct rotation.
A blower that runs too slow can cause an air conditioning freezing problem.
You'll need to install a motor that runs at the correct speed.
A blower that is too small, or that is installed in the housing incorrectly, can cause an air conditioning freezing problem.
You will need to install the correct size blower, and be sure it is installed correctly in the housing.
This means centered, with volutes installed, and the curve of the vanes matching the outlet of the housing.
If the blower motor is the wrong size, if the bearings are failing, or if it has an open start winding or a failed run capacitor, it could be overheating and stopping intermittently.
A motor that is overheating and stopping intermittently can cause an air conditioning freezing problem.
To check out the evaporator fan motor:
Check the resistance readings of the motor windings.
If you get a readable resistance between all three windings, the motor windings should be ok.
Turn the shaft. If it turns free and easy, the bearings should be ok.
If the shaft is hard to turn, lube the bearings with 20 SAE electric motor oil if there are lube ports.
If that frees the shaft, it should run ok for a while, but the bearings or bushings may be deteriorated to the point that they'll sieze again soon.
If the shaft doesn't free up, replace the motor.
If the shaft turns freely, check the capacitor.
The best way to check the capacitor is to replace it with a new one of the correct rating.
If the motor runs, close the air handler panels, and take an amp draw on the motor.
If it's normal it should run OK, and if the motor was the problem, your air conditioning freezing problem should stop.
Ok, if you've verified that the controls and fan are good, take a break for a diet soda, and then we'll see if the evaporator coil or ducting are the cause of your air conditioning freezing problem.
Take a look at the evaporator coil.
Is it clean? Can you see your flashlight shining through from the other side?
If the coil's dirty, you'll have to do some air conditioning coil cleaning.
If your air conditioner is a window type, our page about how to clean window air conditioners has some pointers you might find useful.
A dirty evaporator coil is a common cause of air conditioning freezing,
And it's one of the problems that can be prevented with regularly scheduled air conditioning maintenance.
If the coil is clean, check the ducting to make sure nothing is blocking air flow.
Blocked ducting will stop air flow through the evaporator coil, and this will cause the coil to freeze up.
If your coil is clean and the ducting is clear, let's run the unit and check the operating pressures and temperatures.
If your discharge and suction pressures are low, with a low compressor amp draw, low subcooling, high superheat, and low temperature splits accross your evaporator and condenser coils, you probably have a leak.
Shut the unit down, find the leak and repair it.
Once the leak is found and/or repaired and you're ready to run the unit, our Charging Air Conditioning Systems page offers some tips that you might find helpful.
If you are totally unable to locate the leak with a bubble solution or electronic detector, you'll have to charge in refrigerant to correct pressures, temperatures, and superheat and subcooling values, and it would be a good idea to add some air conditioning leak detector dye so the leak can be found later on.
You have to use some common sense about leaks.
If the leak is so small that you can't find oil or any other sign; unless the customer agrees to pay you for all the time you spend, it's more cost effective to charge in the small amount of refrigerant it will take to get the unit running correctly, finish the service call, and be on your way.
I can't imagine that there's a service technician out there who hasn't run into the same problem many times.
Use some common sense, be up front with your customer, and if you've done your best not only to find the leak, but to get the unit running right and save your customer unnecessary expense, consider it a job well done.
If your suction pressure is low enough to cause the evaporator to freeze up, but you have high subooling and high superheat, either your metering device is restricted or the wrong size, your drier is restricted, or your liquid line is restricted.
Evaluate all of the system's operating characteristics to isolate the restriction.

Copied from the following web site:
http://www.air-conditioning-and-refrigeration-guide.com/air-conditioning-freezing.html

Jun 30, 2011 | Air Conditioners

3 Answers

My ac unit keeps freezing up on the pipes and keeps leaking water everywhere. what could it be the problem.


If you own indoor pets you will want to change the return air filters monthly like religously. You may also need to have the A-Coil other wise none as the evaporator coil cleaned manually. It is located inside the air handling unit inside the house somewhere. It could be restricting the air flow across the coil with daner and dust and/or deris. Sometimes it can be difficult to clean but with care and lots of elbow grease it can usually be done. Be careful not to bend the fins! Once this is completed and the unit still freezes up! Then you can be sure it is low on refrigerant 90% of the time! Cleaning the A-Coils is something you should do or have done anually!

Aug 06, 2010 | Goodman CLQ36AR49 Air Conditioner

1 Answer

Window A/c 10 or 15 days is good working\r\nbefore !0 or 15 days ago all Eveporater and section line freeze fan moter good praper work melt the freeze and A/C on A/C giving good cooling what is problem


Hello
You may try cleaning the evaporator filter,Also cleaning the outside coil or condensor,Simple green works good for cleaning coils and a garden hose.

Also cleaning the evaporator may help.
When unit is running properly the evaporator should feel cool and wet from top to bottom.
Last,the unit could be low on freon.

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

1 Answer

Dometic Quick Cool compressor freezing and evaporator coil


Could be low. First check air filter, air flow, and evap coil to see if it has restricted airflow. If all seems well, its probably low. The specs will tell you what type and how much refigerant. To access system, you will need a gauge/manifold set, refrigerant, and a piercing or line tap valve for the low pressure side of the system. Of course, first, you need to locate and repair the refrigerant leak.

Jul 27, 2009 | Dometic Rooftop RV Air Conditioner

1 Answer

Dometic duo-therm air conditioner freezing up


Make sure that you are not running the unit on low fan speed. In the warmer months of the year, this will often cause the unit to freeze up due to the lack of air flow through the evaporator. If you are running on high and it is still freezing, then you possibly have a freon leak in the system. The brisk airs are notorious for the capillary tubes in the upper unit rubbing together and developing a small leak. The problem is usually where the two small tubes enter the evaporator housing. Remove the cover and pull the two small lines apart, damage should be apparent if there is any. If not, you may have developed a leak elsewhere and need to have someone check out the system.

Hope this helps,

Jeff

Jun 23, 2009 | Dometic 57915531 Air Conditioner

2 Answers

Unit freezes up when nearing 8-12 degree superheat


check to see if your evaporator coil needs cleaning

Apr 29, 2009 | Goodman CLJ30AR32 Air Conditioner

1 Answer

Unit is freezing on the outside at the bottom and fan is not runn


hi! there,
occasionaly freezing on evaporator,severral factorcan be the cause since this is just almost two years,in this case if has no maintenance need to be clean your evaporator fin,debris ,dust particle obstruct the cooling effect blown by your blower fan,so freezing occured,this need maintenance perhaps they can check also the freon charge w/c is one of causes also,if under charge mostly freezing on lower bottom of evaporator occured,check if still on warranty date of purchased,call in on service center where you bought the unit or near service center of the branded name,if under charge you should ask the service man to find the leakage before recharging otherwise it will persist again the problem for a couple of day at time of warranty service,beside leak freon is bad for our enviromental athmosphere
this should be done promptly.cheers and have anice environment,don't forget to rate me,thank's

Apr 08, 2009 | Air Conditioners

1 Answer

American Standard Heat/ac system


It has been suggested to us we change out the thermostat.Good idea considering if the ifs its reading colder than actually appears on readout the unit will freeze up. The unit is working right at this moment, but, when we change thermostats we will let you know the outcome.

Aug 02, 2008 | Air Conditioners

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