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fsd?

what is a flame supervision device,what does it look like?
cathie, August 2008
Hi Cathie, usually you will not see it as it is hidden at the side of the burner.It is usually a silver disc shape with a thin tube coming from it.This has a bulb at the end which sits in the flame when alight to tell the valve to let gas through.All the best.

Foxy, August 2008