Our underfloor heating (ufh)saga continues but we are getting close to solving it. The answer, we believe is CRUD* - accumulated unwanted debris gumming up the works. Local plumber Luke Tyler did the diagnosis and he was bold enough to say that ufh is not his mainstream speciality (and no charge for the diagnosis).
Here is a picture of said crud:
The row of white thingies sticking upwards are transparent tubes on water, one per heating zone, containing a bright red spring-loaded flow indicator - totally invisible for crud! This is the downstairs manifold. The equivalent one upstairs is as clear as a bell. That's gravity for you, presumably. Below is how these little babies are supposed to look:
* besides meaning unwanted debris, CRUD is a computer programming acronym, Create, Read, Update, and Delete (CRUD).
If that crops up at a quiz-night you might thank me for that one day.
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