Sounds like the switch has failed. If the switch fails, the only reverb setting that will work is Hall. If you can return it to the place you bought it, that would be much simpler than trying to fix it. It is possible to get a replacement switch put in. I attempted a repair on my buddy’s Holy Grail Nano which had the exact same issue, but I didn’t have the exact switch on hand, so i just used a regular mini switch. Had to mount it in the side of the enclosure, and I used the hole left by the original switch to install a new 3-way LED that glowed red, blue, or green based on the reverb mode selected. It was actually quite cool. But it was a pretty tight fit — possibly too tight — and something later happened that shorted out a component. Now it doesn’t work at all (no effect signal…. the reverb knob just reduces the dry volume as you turn it right until at full right the pedal is silent). Long way to say… hold out for the right switch. If you can’t return the pedal, and don’t have a repair guy near you, I can swap that switch out for ya. (With an exact replacement switch… lesson learned about getting creative inside a nano enclosure with surface mount components).

This switch is a DPDT switch in on-off-on configuration. I actually mounted it off-PCB (in the side of the enclosure and used a 3PDT on-off-on toggle, and used the third point to add a new LED that changed based on the reverb mode.

bump… can anyone validate LP Bruce’s (and my) hunch?

Lp Bruce I don’t have the answer but I followed the thread in that other forum and I’m curious what the nk answer is. I think you are right but don’t know enough tech-wise to be positive.