outside fan shuts off after 20 seconds by: Anonymous
If you have a fan run capacitor that is bad it will cause the fan to shut off and the compressor also will shut off. The capacitor can be tested with a voltmeter that reads microFarads and the fan can be tested on a regular outlet.
Dec 09, 2013 Rating
Many possible causes by: Anonymous
There are many possible causes to the outdoor fan shutting off. It could range from something as simple as a dirty coil or low refrigerant charge to bad fan motor, etc.
If you are looking for every possibility I would recommend downloading the Heat Pump Troubleshooter at the following location: