I have a payne model PG8UAA42091 natural gas furnace. It keeps flashing code #13 which is for the flame rollout switch/ limit switch. I know where it is at on my furnace I just don't know how to reset it. It is freezing in my home and I would be very grateful to get it working again soon. Any info will help. Thanks in advance.

There are usually several limits &/or rollout switches. Some are manual reset via a small push button in the center, some are auto reset but often require turning the furnace off for a few seconds to reset the board. Others are small fuseable links & must be replaced. Most furnaces do not have all three types.