Farting Norcold fridge

Almot wrote:
Thanks, West. Mine farts only when starts the cycle, and only once. Different symptoms - from that other thread - but the cause can be the same. Metal expanding, or something in burner/chimney tract needs cleaning.

Maybe a combination of both expansion and dirt/soot. As the initial burner flame heats the metal parts, any small opening that is partly clogged may open enough to allow ignition of gas.
As long as the furnace is operating properly, the noise isn't something that should be too worrisome. The next time your maintenance schedule has the furnace on the list, look for any clogged holes or seam corners that could be the cause.