Tenants refuses to let us in the house while they are away

[Anne W.]

Hello all, I am looking for some advice. 

Background - brand new washer provided last July when tenants moved in. They complained metal-striking noises and we ordered the repair under warranty. There were four repairs, even Whirlpool was involved, can't fix. We managed to have Whirlpool to give us a new washer. Three weeks ago, I told the tenants about the delivery. They said that they wouldn't be available. I told them that I must be there to sign the delivery, so no problem. They went silent. I texted them again today about tomorrow's delivery, they said no, they "feel very uncomfortable with people being in the house while they are away". By the way, they are a couple with two small kids. They have cameras at every entrance and in the garage and basement. The property is in a very nice and safe neighborhood (HOA, top schools, etc.).

What's the best way to handle the situation? I am obviously upset because I have to reschedule a delivery after four repairs. The lease states that the landlord only needs a 24-hour notice to access the property. The tenants appear to take care of the house, but there have been at least one repair per month, including quarter-size paint chips on the deck which they want us to touch up paint.