Sharing in case it's helpful - my AVH10 Vornado heater suddenly stopped working.[br]
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I took off the bottom panel (was used to wrap the power cord) and that revealed the safety switch that turns the heater off if its not positioned upright on the floor.[br]
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The switch worked when manually pressed, so the problem was between the casing which has a plastic peg to press the switch and the switch itself.
I bent back the metal pole on the switch and unscrewed a screw at the end of the plastic peg and this has fixed the mechanism for me.