I have a Bryant furnace model 310AAV that is displaying the #13 error code. The furnace is blowing cold air... I've flipped the power and gas off a couple times and now I'm letting it run.

Code #13 says after 3 hours the control will auto reset... does this mean if I leave it running for 3 hours, it will reset and work fine?

Thanks.

The reset that this is talking about is not what you think. You have an airflow problem or inadequate combustion air. This can be caused by a dirty filter, dirty AC coils, or problems in the blower. You need to fix problem then cut off power for a minute to reset furnace. Use the manual to run a test, if necessary. Go here for manual: http://homeappliance.manualsonline.com/manuals/mfg/bryant/310aav.html?idRes=16430908
Let us know what you find. Don't ignore this as it can cause big problems for your safety.