Outside a/c fan quits but compresser still runs

Is the outside running? Is the outside fan running? Probably what is happening the fan outside quits running and the compressor gets hot and goes into thermal overload. need to check to make sure the outside fan is running.

The fan motor is down on the pass side. follow the 2 wires that come off the motor to the heater fan resistor. If you can unplug that it. Most likely the connector will be burnt and so will the resistor. Replace connector and resistor.

sounds like it's running backwards. possibly need a time delay in the condenser. make sure your drain line is clean.also inspect low voltage wires for bare/ chew spots near outdoor unit.

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Quite often the window units need to be tilted slightly toward outside to allow drainage to run outside the window. Try pulling bottom inward slightly so rear is tilted downward at outside and see if that doesn't cure it. You should soon see dripping outside at back of unit where it should be. Make sure you check for small hole under back end and check that it is clean and open.

If the humming is your compressor running (feel the large copper line going into the unit, it should feel cold aftter a few minutes of run time) then the fan motor or the capacitor or both need to be replaced, check for voltage to the fan motor when the unit is "humming" if it has voltage and will not start replace the fan motor and the capacitor. hope this helps.

Sounds like control voltage problem. Tsat mat be bad. It is hard to say without looking. Next time this happens. Have someone stands out side by the unit to see if the contactor is pulling in. When you turn the Tstat off and wait and turn it on you may be manually make the contact in the Tstat. If the fan and compressor are not running when you call for cool, Most of the time it is the control voltage. Let me know if the outside fan runs and the compressor does not. Rusty

That was real deep diagnoses I'm betting the outside unit is the problem. check the outside for240-volts to the contactor if not backtrack for the lost voltages and remove the outside cover to check the little silver can (capacitor) for swollen at the top terminials, due to power surge.

A burned or pitted contactor will/can cause a unit to not run. Outside fan. Just thinking out loud. Start with low voltage check at t.stat then check outside low volt. Set t.stat to on. If fan engages at least your transformer is good. Next set calling for cool. Drop t.stat 68-70. If nothing happens go outside and with a screwdriver depress the contactor in. If fan and compressor kicks in change the contactor. If contactor is pulled in check outside fan. Remove the wires from the compressor and see if the fan will run . If it does you have eliminated start components as good. The compressor has to be check. It needs to be ohmed out. Turn off power at disconnect. Pull the cover on the compressor. Check between pins; then pins to ground. Open or infinite is good.Have you checked fuses. Like small 3-5 amp fuses

Measure the voltage across the line. The outside unit normally runs on 220 Volts. Measuring each side of the line to ground will give 110 Volts. If your outside disconnect is of a fused type one fuse could be blown. If a fuse is blown on one side of the line you will read zero volts differential across the line.

Check the type of fuse used in the disconnect. Make sure the proper size time delay fuse is installed on both sides of the line at the disconnect.

This question is really to broad to answer. There are several things that could cause it to stop running. I think I would turn everything off, let it cool down for several hours and try it again. When you kick it back on, take note of what is running and what's not running. Inside fan, outside fan, compressor. If the outside unit will not run at all it could be as simple as a grasshopper caught in the contacts. If you hear the compressor running outside but no outside fan, The fan motor probably needs replaced. Please make sure that all power to the unit is TURNED OFF before removing cover plates on outside unit and before trying to remove insects from contact points. Check all wiring inside outside unit while it is open. Also check capacitors for swelling or leaking. If you don't know how to turn all the power off or open the outside unit, you need to call a professional AC technician. Hope this helps. kstfas