Why do electric radiators make a crackling sound?

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Why do my radiators make a crackling sound?

Heather Baird Published: Dec. 11, 2017, 1:48 p.m.Last updated: July 29, 2020, 3:37 p.m.

I recently bought a home and have yet to spend  a winter in it, so it is only just now that I turned on the heat and I'm a bit concerned - they make a crackling sound when they operate, does that mean they are malfunctioning and need to be replaced? I’m just concerned that it may be a fire risk, thanks.

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