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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 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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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

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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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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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