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Thanks @ScottishGasMan - Ok, the water side was not washed out, only burner vacuumed, and general check/service. Interesting .... so it could be boiler buildup then! - flushing out the heat exchange might help. The pump is "new" so I would be pretty surprised. I guess I could try it on the...

Ah ... I was hoping you were on to something :LOL:

Thanks Ian, 1.5bar is the stated factory pre-charge on the label ?

Hello All And debug ideas/suggestion very welcome - I have run out of them ..... :sneaky: I have moved into a new house Oct 22 and it has an old, but "good" functional BG 330+ boiler (serviced when I moved in), however it has started to F22 dry fault error. I have read as much as I can on...