Do I need the pipes replacing? Or just a clean?

14 May 2022
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United Kingdom
It’s not my house but my friend is doing some renovation, she mentioned it to me but she doesn’t know if to get someone out or not to look at it? It’s not owned by her but her landlord doesn’t have time to check and tell her but the she thinks they may be getting too hot and that’s why there’s black behind them? It’s a combi potterton promax , any ideas?
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Tell her it’s absolutely nothing to worry about, it’s scorch marks from soldering. Whoever did the work, didn’t protect the area very well, if at all. Easily painted over. The grey on the pipes (in case she’s worried by this too) is from soldering too, it’s solder and just sloppy/rushed workmanship.
I am guessing that the black is from the blow torch that was used to melt the solder.
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