
CHF210.–
Stadler Form Theo
40 m², 10 l/24h

Stadler Form Theo
40 m², 10 l/24h
I have been using my Theo for about a year now and I've been using it pretty much daily for hours. Lately it has started to produce a sound while working, like a low hum that can be better heard from the room next to it. It sounds like a vibrating phone. Is that a cause of concern?