20 Most Recent Duravit 0910100005 Happy D Toilet Cistern - White - Page 4 Questions & Answers

The check valve may be defective. Replace.

Contact the manufacturer.

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The level is determined by a floating device connected to the water valve. Some are on an angled arm and some move up and down. Determine how your valve is shut off and either change the big round float or adjust the clips on the rising one. Just keep the level below the overflow and the flush handle to avoid a running toilet or a leak.

Yup

If you raise the toilet you will have to raise the plumbing so you have little choice.