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What causes my evaporator to freeze up - Heating & Cooling

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This can be caused by a few things.Check for a clean air filter. If the filter is dirty the air flow is slowed and lets ice form and over time the coils freeze over. The next thing to look for is a dirty evap coil. Same thing. if the coils are dirty the air flow is restricted and causing freeze ups. if this all looks ok then its time to call in the pro's. For environmental purposes all HVAC techs are citified to handel freon in the correct way. They will check the system for leaks and repair them followed by a freon recharge.

Posted on May 12, 2009

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1 Answer

Top of freezer will not get cold, whats wrong?


You either have a bad evaporator (cooling coil) fan motor or a failure of one of the defrost system parts. This would cause the evaporator to freeze up and block air from going to the freezer.

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Rheem 13AJA30A01 freezing


You have one of three problems. First freezing can be an air flow problem. Air flow could be causes by using the new pleated air filters. The best one still blocks >35 % of the air flow. The best air filter for home ac units is still the blue mesh type Ace hardware sells. If you have a good filter then you need to check out the inlet side of your evaporator to see how clogged the air inlet is. If it is dirty the air flow is reduced and if reduced enough, the evaporator can freeze solid all the way out to the compressor. The second cause for freezing is a bad or improperly operating blower motor. The third possible cause for freezing is the metering device not functioning properly and metering to much.

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Conair mini split heat pump isn't cooling but has cold suction line but warm liquid line and is not freezing up the evaporator. Thinking a sucking reversing valve?? What could cause that? Both evapor


Make sure that your refrigerant charge is good first. Reversing valve has 4 pipes coming off of it. The one alone is discharge and centre of 3 is suction always. The two sides are the reversing pipes. One side should be same temp as discharge and other same temp (+-5F) as suction. If not then you have bypassing refrigerant in valve. Bad.

Jul 13, 2013 | Heating & Cooling

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Why does my ac freeze up


Hello, air conditioners will freeze either due to low airflow.....such as dirty filter, dirty evaporator coil, weak or not running blower motor. Also, a low refrigerant charge can cause the unit to freeze up.

Jul 09, 2012 | Danby Heating & Cooling

1 Answer

Unit freezing up when running


The most common causes of evaporator freezing are:

dirty or obstruccted evaporator coil,
evaporator fan not working or working too slow.
and the most frecuent is LOW on R-22 Refrigerant. Check lines, look for wet looking spots and greasy/oily stuff on the lines.

Good luck!! Rate this post!!

Aug 10, 2010 | Breezaire WKCE 2200 Wine Cooler

1 Answer

My condensor in the furnace ices up which restricts the airflow. Is this normal. When I shut off the air conditioner the ice melts and causes a minor flood in the furnace. thanks


The indoor coil or "Evaporator Coil" (condenser is the outside coil in air conditioning) should never freeze when an air conditioning system is installed, maintained and serviced properly.
The most common cause of evaporator freezing is a clogged or dirty air filter. Other causes include; a clogged or dirty coil; blower malfunction, filter too restrictive (in which case use a less restrictive type), undersized duct, closed and or covered registers and grills, and collapsed duct.
Another common cause of evaporator icing is loss of refrigerant in which case you should call a professional who can locate and repair the refrigerant leak and recharge your system.

Jun 25, 2010 | Carrier 38CKC036 Air Conditioner

1 Answer

Roof top a/c is freezing up what can be done?


Check the refrigerant charge. A low charge will cause it to freeze up. May need to have some added. Also check for dirty air filters and make sure the evaporator coil is clean. A restricted airflow will cause it to freeze up also because the air isn't transferring heat in the evaporator. Let me know if this helps.

May 20, 2010 | Dometic Rooftop RV Air Conditioner

1 Answer

I have a side by side and the freezer is frosting up and this causes the frig to get warm.


Check your door gasket. Check to be sure, that the doors are closing completely. If there is air leakage, your evaporator will freeze up. This is caused by warm humid air being sucked in and collects on the evaporator. If the evaporator. freezes solid, you will have to unplug the box and allow it to defrost, unless you know how to advance the defrost control. I hope this helps? Good luck.

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2 Answers

Teco split system freezing up.


When you reversed it the fan stop because it went into defrost mode,Change the filter,clean the coil,let it thaw,and if it happens again,it may have a clogged cap tube or a leak in the system.

Please rate this solution.

Jan 20, 2009 | Samsung AW1203B Air Conditioner

1 Answer

Freezing up


Primary Cause is Thermostate
Secondary Cause only Anti Freez Switch which is attached to the Evaporator Coil unit

Good Luck

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