Ferroli Domicondense no hot water flow at all!

[Masood]

Cold water flow rate and pressure into the boiler is fine. Nothing out of any of the hot taps. There's no crud in the inlet filter. Could the hot water side of the heat ex be completely scaled up? It is a hard water area...

If so, best way to clear it please? Preferably without stripping the whole boiler down...

 

[jonnyswamp]

Whats the ch filling valve like on those, not like the Vaillant is it? whereby if the cold main side isn't closed after filling, no water goes through boiler for hot out
EDIT not trying to teach you how to suck eggs Mas, but had a few different fill valves and iso valves that looked on, but were actually off due to custard error

 

[Masood]

Cheers for the thought Jonny but external filling loop..

Found out today that the tenant recently fitted a new bath tap. Going to investigate that first. Wasn't told that last night!