Broken microwave in Sim house

If you click the broken item while in “live” mode, you should see a pop-up that says “[this item] is broken” and you’ll see a green button with the simoleon amount needed to fix it. Click the button to fix it.

I've seen that with other objects in the game nut the microwave just bounces when I click on it. The repair option doesn't appear at all.

Are you trying to click it with a sim who is currently active in another event, or is one of your sims currently in the cooking hobby event?

I had both Sims take a nap and then when I clicked on the broken microwave, the repair option appeared so it's fine now. Thanks.