- Press the party mode button until the temperature display flashes.
- Set the temperature to 35 °C.
- Press OK to confirm.

Admittedly, when it's still nice and warm outside, you rarely give the heating system a second thought. But you really should consider testing your heating system before winter comes. The Viessmann heating check makes it a quick and easy process.
The following brief guide is an example of the steps involved in the heating check. Please refer to the operating instructions for your heating system to see what operating steps need to be performed on the heating controller.
You can easily identify two common reasons why "it doesn't get properly warm" yourself. And with a little technical knowledge, you can fix it yourself, too.
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