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Yes, I checked and I hadn't tightened the key that fills water into the system well enough! Thanks for your reply!

We have a Vaillant Turbomax Plus 824E that was fitted in 2003 and has been working fine since. But recently I noticed water seemed to be dripping from it - and today I opened the front and saw that the water guage has filled up to past the red danger area! Whenever I've had to fill up the...