had the pump reversed? Holey moley...
I know this opinion wasn't requested, but...
I'd keep a eye on that system for other problems...pumps are clearly marked for flow direction, and having it reversed should have been an incredibly obvious problem--without looking at the manual.
I know there are radiation piping schemes where you might reverse flow on a boiler, but they aren't too common.
I guess what I'm saying is to me that was not a mistake a pro who genuinely understands hot-water/hydronic heat should make.
Keep an eye out for continued performance/condensation/consumption/comfort issues...
I'm not a pro, but I've sheperded over a dozen boiler replacements in buildings I caretake and learned some hard real-world lessons over the years.