by yehudi » Fri Mar 16, 2012 7:19 pm
It is not your responsibility such a law exists or not. If the landlord insists it is against the law, ask him to point it out (he will fail) and that you would be happy to abide by it. If the lease doesn't prohibit the use of the machine, using one does not put you in breach of contract. And it is too late for the landlord to change the rules until the end of the original lease.
The bottom line is that your landlord likely wasn't aware that portable dishwashers exist so had never thought to include a clause in his lease prohibiting them and is trying to bully you when he has no legal leg to stand on.