Who is responsible for water damage caused by a faulty washing machine. The damaged party has no insurance?
Who owns the washing machine? If it is the upstairs tenant and
he has tenants insurance (as you should) then his insurance pays.
The landlords insurance company would also pay and your insurance
company will take care of it all. Let them duke it out. If you are
the landlord and you did not require your tenants to carry
insurance...does the word "fool" mean anything to you now?