Pneumatic time delay switch keeps getting stuck?

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If it moves and it shouldn't, use duct tape. If it doesn't move and it should use WD-40.
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WD40 is a water displacement device (the clue is WD) not a lubricant. Use a thin oil.
WD40 is a lubricant as well as a moisture displacement. It leaves a very fine film but has the added advantage that it does not attract dust like other oils/lubricants do.
It doesn't help when people poke the pneumatic ones with a screwdriver or similar pointy thing to prise the central button out to its off position. :evil: Doing that causes rough bits on the plastic which just exacerbates the stickiness problem & then the switch needs replacing.

Edit: If you lubricate them, be aware that it may make them switch off a bit earlier than pre-lubrication. There's a screw on the back of the switch that adjusts the time it takes for the button to pop out. (Obviously you'd need to switch off the power at the consumer unit and prove the circuit dead before you tinker with the timing screw)
Get a new switch. I tried loads of times on different switches various methods to free up sticky switches, and nothing ever works properly.

A new one won't break the bank.

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