OOP Analysis designing a UML Class Diagram

I have this excerpt for and application,the application is used in a bakery to control two ovens (let’s say, one for cooking cookies and the other for bread).

This application receives events from each oven (turned on/off, temperature change) which it displays on the thermometers shown. In case an oven is off, its group of GUI elements must be grayed out.

The monitoring application must keep timers in order to fire an alarm whenever any of the ovens has been on without interruption for more than 15 min at a temperature of 250°C or higher. The monitoring application itself sends no signals to the ovens, it lacks all control functions.

I need to Prepare class diagram for the ovens and the monitoring application and the statechart for the monitoring application to update the GUI.

Some help me come up with the class, properties attributes and the methods.