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Coil freezing up - Heating & Cooling

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An a/c coil freezes up because there is no heat load on the coil. It's either dirty, low on refrigerant, filter dirty, the fan is not running. Defrost the coil by leaving the unit off until defrosted. If the coil is accessible you use a coil cleaner thru a chemical sprayer and spray coil. Do not use the stuff they sell at Home Depot or Lowe's they don't work. get some from an a/c contractor or supply house. After with the chemical sprayer rinse the coil with water. You may have to repeat a couple of time to get it good and clean. If you can not access the coils then you will need to pull and clean the coils. To do this you'll need to pump down the refrigerant into the condenser coil and cut the evap. coil out of the system clean and reinstall. With this you'll need refrigerant gauges and know how to solder and have access to refrigerant. The same if your low on refrigerant you,ll need access to gauges and refrigerant. Depending on system it's either R-22 or R-410 refrigerant.



















































Posted on Sep 27, 2008

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1 Answer

Fix freeze up


There is a reason they freeze up 1. low on freon..2 evaporator coil needs cleaning(inside coil)..3. very dirty air filter, any one of these for a an air conditioner may freeze up... due to a number of other reasons. The most common reason for an air conditioner to freeze up is low on refrigerant.

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HI HAVE GOT A SWAN SH3010 DEHUMIDIFIER BUT THE COIL KEEPS FREEZING OVER WHAT AM I DOING WRONG?


Nothing.That's how it works. The coil gets cold. The moisture(water) in the air freezes to the coil. The coil then gets warm and the ice melts, dripping into the bucket or out the drain hose.

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Model GSS25SGMCBS coil freezes.heater checkedout ok service man changed the circuit board for $312.After 3 days, same problem again. Freeze temp ok but refrigirator sectio quit working after coil freezes....


Hello,
Control board is new, heaters ok, Check defrost thermostat and thermisters located on evaporator.
PC board not getting information to defrost properly.See site below

Also check the fill tube at ice maker . Iv'e seen these get loose and fill evaporator with water causing ice block

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GE Refrigerator Repair Guide

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1 Answer

The front of the unit behind the filter freezes up. Worked flawlessly for weeks but freezes up. Cleaned the filter several times but continues to do so.


the reason for the coil (behind the filter) to freeze up is 'low air flow' over the coil, which is usually caused by a dirty filter AND/OR the coil itself.
Be sure the coil is clean and not clogged up. Shine a flashlight into the fins and be sure it's clean.
If it is clean then you need to look at the fan motor. Is it blowing correctly? Is it cutting off at times?
Low air flow across the coil is the main problem with coils freezing up, although less likely is a 'low refrigerant charge.'
I would make sure the coil was clean and the motor was blowing air across it in the proper manner.

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My Airconditioner has ice forming and no cooling. can u suggest what the problem cud be?


Most likely a slow refrigerant leak. When the refrigerant is low, it actually gets colder and causes freezing in the coil. Another possibility is the coil is dirty, not allowing enough air flow through the coil. You didn't indicate if this is a room air conditioner or one attached to your furnace.In either case the coil should be cleaned first. Then if it is still freezing, you will need to have the leak repaired and refrigerant (freon) added to proper level.Normally the coil is not below freezing, but when the pressure drops too low it gets colder and then the condensate that normally drips off the coil freezes.

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2 Answers

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you need to check your filter to start with if thats good make sure all you vents are open and your returns are free from abstruction

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Frigidaire central unit freezing up leaking


The coil freezing can be caused by a couple of things. 1) Not enough air flow over the coil or 2) A low refrigerant charge. First make sure that the indoor fan is running. Then check your air filters and make sure your evaporator coil is clean. After that you can get the refrigerant charge checked. The lower the refrigerant pressure is, the lower it's boiling point is and when it gets below 32F then the evaporator coil and usually the low pressure line freeze up. The leaking you were talking about is probably from the ice melting. Hope this helps.

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Coils freeze up


Make sure blower is running at the proper speed, if it's running to slow do to bad bearing or capacitor, the coil will freeze up.
Check evaporator coil and filter to see if they are dirty if they are then the coil will freeze up
Check the charge if it's low on refrigerant the coil will freeze up.
If your not sure how to check these things, then you should have a HVAC company, check it out for you.

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In the freezer coil is a defrost heater coil, and a defrost thermostat. You have to expose the freezer coil to find them. If your local dealer can't get parts, I get mine from Repairclinic.com.

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Usually when the indoor coil freezes up you either have dirty filters or coil but if you had this unit replaced last year your coil and filters are probably OK so you probably have a leak in the unit and are low on refrigerant.

Apr 24, 2009 | Heating & Cooling

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