Repair service is needed if the device isn't working properly (when the device needs several attempts to start, when it smokes, when starting takes too long, when the heat output is reduced, etc.)
Before you dismantle or call, go through the following check-list.
Check the type and serial number of the device.
Contact your nearest Wallas service provider and ask the service provider about the best course of action.
You can also call the factory with any technical questions.