A couple of disappointments here?! first the 3000S was replaced by the 3600 in mid 95!
Worse though and I'm assuming you mean a bit more than just the knob that you turn.
Both model fires, if manual ignition, use the same gas control rod with a piezo igniter set in the rod, this is now as rare as hens teeth and very difficult to find.
On the up side, a broken one is easy to repair and if it's auto ignition? then I have these control rods
A day of all things motorhome and campervan. The show is held both in the main indoor arena and across the grounds. Catering, hot drinks and food options are available. Easy access to the site and free parking included. Win one of five pairs of day tickets