Why Would New Pressuretrol Fail

Unknown

I'd say you answered your own question. Gunk probably got in there and uh,,, gunked it up. ;)

Librarian_2

We replaced our boiler just under a year ago. It was properly set-up and installed. The L404F1367 pressuretrol that was supplied and came installed failed two weeks ago. It stuck and would not cut the boiler as pressure rose over the limit (no matter how high), and also had some issues with allowing a cold igntion. Fortunately this was just within the warranty period and was replaced without any hassle.
However, we are wondering what could lead a new pressuretrol to such a quick failure. The only unusual thing that we noted is that after we had run the system twice this season, the water suddenly became filthy and we had to do significant skimming. When we called for service the first thing checked was the 'trol and the pigtail (tee on top of the copper loop to hold both the 'trol and a better pressure gauge), we'd already skimmed but the tail was also filthy. Claaning it did not make the 'trol work.
Is there something we else we need to keep on top of, or do we chalk this up to just random bad luck? Or - are these just poor devices that are prone to failure?

nicholas bonham-carter

faulty pressuretrol

better to have a vaporstat.
the mechanical linkage now neccessary to control the non-mercury switch seems unreliable at low pressure settings. i had to replace mine in the 1st month!-now i can close the main vents at 3 oz. and be fully hot by 5 oz!--nbc