Overpressure during standby

Problem description:

Overpressure in standby mode.

What can I do to solve the problem? 

The reason for this error is that the hot sterilizer is left with the chamber closed (e.g. overnight). As the sterilizer cools down a vacuum is created in the chamber which causes a startup error. Wait until the device has equalized the pressure automatically – the message will disappear automatically.