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Our central air has started to not cool. I have looked at the outside unit and lines going from the unit to the inside of the house are frosted. What is the cause and how to fix it?

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When lines are frosted you have an air flow problem ie dirty filter or blocked return air grill, fan problem or its low on refrigerant

Posted on Jul 18, 2008

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I have a uaka-018jaz outside Central air unit. The other day the unit is still running but nothing is blowing out of the vent inside house in floor. The condenser or coils in the vent frosted


First you have to make sure the blower motor is running. That is the fan motor on the indoor unit. If the fan inside is running and the filter is clean you are likely low on refrigerant. If the indoor fan is not running this would be the reason for the frost. If the unit is iced up turn the system to off and the fan to on on the tstat. This will help defrost the coil. Good Luck.

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Unit not cooling inside below 72 degrees lines sweating


how hot is it outside??? 20 degree split is usually the norm ,,,,,outside 95 then inside will be 75,,,,,where is the line sweating ,,, it should sweat near outdoor unit

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I have some things for you to check. If you look at the outside unit the lines going into the house. Are they frozen? Have you had any yard work done, the reason I ask is they could have accidentally cut or pulled out the thermostat wires to the ac unit. Also, inside check for the same thing, frozen lines. Also, you may want to check the drain coming from the inside unit, it may be clogged.

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Central air conditioner doesn't cool


no cooling means outside unit is not operating due to
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Apr 27, 2009 | Heating & Cooling

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can u give me more info? have you felt of the large copper valve at the condenser? have you checked your air filter? get me a temperature reading of the large copper line and the ambient air around the condenser, and out going air of the condenser. also what is the sq. ft. of your home, and the model # of the indoor and outdoor unit. thanks J

Jul 12, 2008 | Ruud Matching Split Air Conditioner

1 Answer

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I would take a very close look at every solder joint there is between the inside unit and the outside. If you observe oil at any point it indicates a leak at that point. That is an expensive price for what you say was done. Check your invoice for the amount of refrigerant they or he added to the system. Compare it with the amount stated on the outside unit nameplate. Check for frost on the suction (big line) by the outside unit. If there is frost your coil is frozen up. If this is the case turn the fan on and the cooling off. Allow it to run in this manor for about an hour to defrost the A coil. Then return to the cooling mode.

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1 Answer

My central air never kicks off


Sounds like you need to recharge it .. To tell while the unit is running go outsiode and feel the large insulated copper line going to the unit it should be cold to point od sweating like a can of coke you take out of the refrigerator and sit on the counter. also feel the air coming out of the unit outside it should be warmer than the outside air if not your freon is low

Jun 09, 2008 | Weather King 10AJA2501AH Air Conditioner

1 Answer

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Do you have any frost on the lines going to the outside unit. If the large line is frosted your evaporator (Cooling coil in the furnace) could be frozen up. Operating it with the fan in automatic with the cooling on will sometimes be the cause of this condition.

If there is not frost on the large line going to the outside unit and you are getting air circulation inside the house the problem could be a loss of refrigerant charge. Look at the joints where the pipes were soldered to the inside and outside units for signs of oil. If you find oil at any point it is the indication of a refrigerant leak.

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