I have a Goodman furnace, model # CAPF3636A6DA, serial # 1105016366, I am trying to convert from LP gas back to natural gas, can you help me?

Furnace Propane Natural Gas Conversion – HVAC How To

Buying the correct propane/natural gas conversion kit and following the instructions for your furnace is key.

You will need a gas valve for NG, or your LP unit may be convertible, search your model and look for conversion kits. eBay has conversion kits listed. You will need new gas jets. Jets are easily replaced and can be found online. I have changed jets but not the gas valve. My Maytag gas range is easily converted by screwing the jets down until they stop and flipping the spring and insert in the gas valve.

https://www.justanswer.com/hvac/4sw8...e-propane.html