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I have central air and it comes on but blows out air (not cold) and only stays on for a few minutues and then shuts off and continues this cycle

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Your central air needs Freon R-22, do not use it, it is going to damage your compressor.

Check the leak first, fix it and fill up Freon R-22 by professional licensed AC person.

Posted on Jul 07, 2008

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My Dometic Rooftop 15000 BTU Model 459516.701CO will come on and run and then shut off it continues to cycle within minutes of shutting off it is controlled by a Dometic Comfort Control Center 2...


THE OUTSIDE FAN MOTOR MIGHT NOT BE WORKING CAUSING THE COMPRESSOR TO GET HOT AND TRIP THE INTERNAL OVERLOAD IN THE COMPRESSOR - IF THE UNIT IS LOW IN FREON SAME RESULTS - WHEN UNIT IS FIRST TURNED ON DOES IT BLOW COLD AIR OR DOES THE AIR NOR FEEL COOL - JUST COOL AIR COULD BE LOW FREON - COLD THEN WARMS UP IS FAN PROBLEM

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My mistral reverse cycle mss25ss model does not work at all in heat mode. what would be broken?


firstly is the air comming from the outdoor unit cold or warm? if it is cold then the 3way valve is working and it has changed to heating. If it stays warm then it is still in cooling mode. The indoor fan wont come on until the coil temp gets warm enough, ( so it doesnt blow cold air on you straight up). If it is changing into heat mode then the larger of the pipes connected to the outdoor unit should get warm/ hot. If this is not happening then the unit is either out of gas or the compressor is on hollidays and wont come back to work.

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1 Answer

Unless we set the thermostat very high, like 80 degrees, the heater will blow cold air. When the heat does blow, it will eventually stop blowing heat and the fan will continue to blow cold air.


Check and make sure the filter is clean. This sounds like a restriction in the system. If the unit has central cooling make sure ther indoor evaporator coil is clean at the furance.The unit may be cycling the burners on and off at the high heat limit , fan/limit control. You can also eliminate the thermostst from the furance. Turn power off at the furnace and disconnect the wiring from the thermostat. Jumper the red and white wire together. Turn the furnace back on. The furance should run in the heating mode. Try this and see if the problem is still there.

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RUUD AC cycles warm & cold 24/7


Hello Anna Sounds like the compressor is overheating and stoping on overload internally.Then it cools down restarts and runs into overload again.I would like to see the freon pressures when running.Could have a clog/restriction in piping.I dont like that you went thru a compressor already, the original installition is suspect.The original (1st) failure cause must be corrected.Check the TXV valve replace, filter/dryer look for a kinked pipe are ideas for overheating.Make sure condenser coil is free (ari flow)& clean also.

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The contactor in the outdoor unit is stuck.You will need to replace the cooling contactor.I am sure it is wielded shut and thus will not turn off.

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1 Answer

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Hi, You are getting low on refrigerant. The A/C cranks up, vaporizes all of the refrigerant available to it and the compressor shuts down. The fan continues to run.
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My Rheem central A/C blower motor cycles on & off


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Central heat/air unit for home blows cold air


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whats happening is thje heat exchanger is cooling off and cycling the fan off this is a normal occurance whenever the unit is first turned on.

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