Hi,
making coffee this morning, and was in the process of purging after steaming. I went to turn the steam knob off, and it refused to budge. It's stuck tight. I don't want to force it, lest I break something.
We only use filtered water, and follow backflushing (water and chemical) regularly, so I'd be staggered if a build up of scale is the problem.

Anyone out there know what the problem might be? Also anyone know how to resolve.
As sods law would dictate, this has occured during the one period of time my local Lelit service option is shut down for holidays!

Thanks in advance.