I just had my unit gased up. I'v got an upstairs fan with an outside compressor. When I turn the heat on the fan will start running. The compressor will kick on for about 3 seconds, then the compressor will shut off. Then when I turn the airconditioner on the compressor will steady run but the fan upstairs will not come on... what is my problem?

If you just had your unit gassed up then I would call back the professional licensed service person and tell them to fix it correctly. You paid good money for there work and they should stand by there work and take care of the situation.