Smitty Two wrote:

So the g.f. and I are chipping in on a newly remodeled investment house
in her city, 300 miles from me. Home inspector sent a report that
included a notation that the outlet intended for the refrigerator is
giving an odd indication on the 3-LED tester: All three lights
illuminate.

Any speculation on what could cause this unlisted and presumably
improbable test result?

If it were somehow wired as a 240V outlet you would get all three lights
(usually neon, not LED). Some fault that would put the opposite phase on
the neutral for that circuit could cause that. Presumably if it's for a
refrigerator, it's the only outlet on the circuit. If the wire got mixed
up with a 240V feed for a window A/C outlet, they could have connected
the white to the other phase instead of to the neutral buss.