Thanks for your reply, I've actually found out what it is now. It's a booster switch. When set to 1 it boosts the system when the bathroom lights are turned on.
Hi,
I have a a Silavent Quadvent 750 ventilation system in my apartment, and it seems to work an absolute treat. However, under the box, and connected to the main Silavent box by a thick wire, there is a further smaller box with a black dial switch. The switch has two settings, 0 and 1...
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