Guys, please 😊🙏🏻. Are these 5 sentences correct?
1- While I set the table you should reheat the leftovers in a casserole dish
2- How many mats must I put? Only three, your dad is going to arrive late home. He's stuck in traffic.
3- I don't have an egg timer at home. How does it work?
4- If you fancy a cappuccino ,then the coffe machine is in the kitchen.
5- The microwave fan is making a lot of noise. You should turn it off while it gets cold a bit.

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Overall, very good! :)

1. Excellent, only minor punctuation notes:
"While I set the table, you should reheat the leftovers in a (or maybe you meant "the"?) casserole dish."

2. Good, but I would say "should" instead of "must", because "must" in English is a strong word. "You *must* set the table" is a command, for example. Also, one note on word order - it should be "arrive home late" and not "arrive late home". First the place (home), and then the manner (late):
"How many mats should I put? Only three, your dad is going to arrive home late. He's stuck in traffic."

3. Perfect!

4. Excellent, just a tiny spelling mistake - "coffee" has two "e"s. As a side note and *not* as a correction, it's worth mentioning that while "to fancy something" is appropriate and natural in UK English, it would be strange to hear it in US English.

5. Very good, but when we're talking about electronics overheating, we say we need to let them "cool down", and not "get cold". So if you're computer is making a lot of noise, for example, you might say you need to turn it off so it can cool down before it overheats and crashes.
"The microwave fan is making a lot of noise. You should turn it off while it cools down a bit."

Great job!