I've never left a dishwasher unused for any long period of time, but if you
DAGS on the subject, you will finds lots of hits about the danger of seals
drying out and causing leaks. I don't know if that equates to "probably"
but the potential does exist.
I would say that the only way to know for sure would be to try it. You
could pour a quart (or less) of water into the unit and then run it on the
Cancel/Drain cycle, assuming it has one. That way if it leaks it'll just be
a small amount. If you can get a towel under the unit before the test, that
would be even better.
One other item: depending on the age of the unit, it might make sense to
just upgrade to a more efficient model and eliminate the potential for a
leak caused by non-use. Newer models will have more features, may use less
water and may do a better job.
I'd do a test wash cycle with the bottom cover removed so I could watch
for leaks. If the shaft seals on the pump are not leaking, a hose may be
rotten and cracked and that's what I'd look for. ^_^
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