My unvented system is overflowing, dripping, and the Tundish is so scaly the water is dripping on to the floor. We noticed it because the ceiling downstairs developed a wet patch.
My own diagnosis is that there seems to be two issues. 1. it is overflowing and 2. the tundish is blocked.
Will it be ok to use descaler on the tundish pipe to get that flowing to at least relieve the symptoms while I get someone to look at why it is overflowing in the first place.
Where does the overflow go?