My (newish) 30-min dial timer for my bathroom lights keeps sticking. I've been told that some silicone based lubricant should be safe to spray into the mechanism. Am I going to burn down my house?
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Contact cleaner was my first thought too, I’ve used it successfully to unstick potentiometers like volume knobs.
In this case, depending on the source of the failure, neither that nor the silicone spray might be sufficient. There’s probably a spring in there which could be stuck or partially rusted from moisture (in which case a selective dose of WD-40 would help, followed by some form of lubrication). I’d try to take the cover off and take look at the mechanism first.