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Overpressurizing Smith boiler
I have a 22 year old Smith boiler that had a tankless coil. I recently capped the tankless to install a 40 gallon Superstor. At the time of install, just to be safe, I replaced the relief valve, expansion tank, feeder/backflow, hyvents, and tridicator. Did a very good purge on all zones. Been back to this house several times and the customer claims the relief valve is dumping water out. Replaced the relief valve again just to see if it was bad out of the box. Xtank read 15 psi. I have yet to see this thing dump, so maybe the customer is full of it, but what else could be causing the overpressurizing? Boiler maybe leaking? No signs of it anyway. Any ideas appreciated.