Repairing IKEA DUKTIG play kitchen

Today my wife bought a used IKEA DUKTIG play kitchen for our children. We payed about 35 € for the kitchen with several accessories like pans, pots, cooking spoon etc. The highlight of the kitchen is the cooktop which can be turned on and off to glow red which look like a real cooktop.

After putting in six (!!1) AA batteries I pushed the buttons and… nothing happened. Damn. The cooktop was broken. My daughter (2.5 years) supervised every step. She pressed the buttons like 20 times before she looked in my eyes and asked: “Putt”? (German children’s language for broke). Her voice was deeply saddened. I smiled and responded that she should not worry and that I am certain we can repair it. She immediately started smiling and responded with: “Pieren?” (German children’s language for repair).