A few weeks ago, my oil-fired water boiler started continuously leaking water out of the pressure release valve on the top of the unit. I know this is leaking steadily because it drains into a 5gal bucket and I have dumped it twice now. I examined the system and determined that in order to keep leaking, water must be fed into the system from somewhere. So I looked up this Pressure Reducer Valve and determined its function - filling the system when water pressure gets low. I also read online that this valve can malfunction and let in too much water pressure causing this sort of leak.
My Pressure Reducer Valve is part number: Taco 329-3
I see screws... can this be opened and cleaned or should I replace this Pressure Reducing Valve entirely? Is there anything else I should check in my diagnostics?