Can you hear it operate? Mine has a sort of electrically operated switch
rather than solid state or relay type to reduce battery consumption and
are clearly audible when they make or break. It also only operates when in
its housing so to test you'd need to bring out wires from that to connect
to a DVM.
*I feel like I'm diagonally parked in a parallel universe*
Dave Plowman firstname.lastname@example.org London SW
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