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AC shutting down, not cooling

Yesterday, the fan outside shut down, and no cool air was coming out of any vent. I turned the thermostat to fan only, thinking that something might have frozen, hoping it would defrost, but 4 hours later, i hit the reset button on the fan, it started up, theni switched the thermo back to cool. It seemed to work for 5 minutes, then the outside fan shut down again...no more cool air. This morning I jumped in the attic to see if the filter was dirty, and I found NO FILTER INTALLED. I rent, so my investigative possibilities are limited. This system is 2 yrs old, put in when the landlord bought the property. Any assistance is greatly appreciated.

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If you say its 2-years old, get it fully repaired and checked out right while its still under warranty, some units has only 3-years warranty.

Posted on Sep 04, 2008

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Your landlord needs a service tech !sounds like you have a few issues.possibilities include control issue,plugged evap coil,plugged blower wheel,possible freon issue.This one's a little too big to handle here.

Posted on Aug 18, 2008

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2 Answers

2002 4 ton Bryant air conditioner shuts off, fan still runs but not cooling is problem in the controls in the attic or in the AC unit or both?


With a non heat pump it is a simple 24 volt AC control circuit. In the attic there is a relay that is actuated via the fan control wire directly from the thermostat. On the thermostat there is an auto/man switch that controls the fan. Manual the fan runs all the time. Auto fan turns on and off with the outside compressor.

If the system is not calling for cool and the fan continues to run the fan relay is sticking. common problem. Sometimes after running for several days the relay will stop sticking if not, replace relay.

If the system is calling for cool and the compressor stops I would still expect the fan to run until thermostat tells the A/C to off. Some compressor units include a safety switch or high-pressure cut-out switch A blocked internal valve bad control board or external fan in outside unit defective no air flow in outside unit.
High pressure cut out not good,

Suggest turning temp max cool and observe. If acceptable cool and the compressor runs without interruption all is good, except for the blower in the attic. Safely check relay in attic blower circuit.

Hope this helps.

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Do you hear a click sound as the compressor shuts down? If so that is the clixon (heat sensitive circuit breaker) that is opening and shutting down the compressor when it overheats. You have not had the AC filled with refrigerant so overfilling the unit cannot be an issue.
And if it is not overfilled overheating is caused by excessive current going into the motor which could indicate a problem with the motor windings..

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1 Answer

Blower Turns off if ac unit comes on. No air coming through vents


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AC Compressor running outside but no air coming out of inside vents.


Can you say, WOw, Icould've had a v-8 moment! I think you answered your own question or you are not far from the answer. (let me direct you, either the thermostat or the little door on the duct going to your room! Thank-you-very-much!

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My AC unit keeps freezing up on the copper lines going into the house from the outside unit. It also freezes up on the inside lines and the air is not cooling my home down.


Operate your air conditioner with the fan in the on position. But first turn the fan on, turn the temp up or shut the cooling off. Your coil is more than likely frozen over. At night when outside temperature drops the refrigerant pressure and temperature in the system also drops. This action can cause icing of the cooling coil, with the fan in automatic everything shuts down at the end of a cooling cycle. Thus no air movement to melt ice on previous cooling cycle.

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