Does a landlord have to give 24 or 48 hours notice to enter the property?

Question Details:

I called our landlord Friday about an issue with our refrigerator, and asked if they could fix it. They asked if they could enter the property Saturday. I explained to them that I was uncomfortable with them being there with none of us home since I hadn't talked with everyone to make sure it was okay (there are 4 people, all on the lease) and that I would call them on Monday when I had returned. Before I arrived on Monday, they called a different tenant who verbally gave permission without consulting the other tenants. When the landlord was here, he also set a sprinkler up without asking. Also, must this be a written notice?

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