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| Had this happen to me. There is a valve with a steel ball bearing that prevents water from flow back. The ball bearing may be stuck, or the rubber broke. If you can find it, usually at the bottom, you can first try to clean it out, or else replace it.
You can probably find a professional to fix it for you for about 200CHF. | |
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When you say at the bottom, do you mean past all the filters? I found like a kind of wheel, but it was not clogged in with anything. Beyond this, it looks like dismantling beyond my (very limited) D.I.Y skills.
Wish me luck and thank you to everyone's for offered advice.