Man: Hello?
Woman: Hi. It's Laura Cariton here. We've just arrived at the holiday flat, but I can't get the hot water and [1] to work.
Man: Oh right! That's easy. Don't worry. In the upstairs [2], you'll find the water heater. You'll see three main controls on the left at the bottom of the heater. The first one - the round one on the far left - is the most important one for the heating and hot water. It's the main control [3]. Make sure it's in the 'on' [4]. The switch is 'off'. That's probably what's happened - it's got switched off by mistake.