If you don't really have a solid understanding of what you are doing, a licensed boiler service technician can be well worth the cost of the service call.

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If the pressure is below the relief valve setting, the relief valve may be faulty. If the pressure is at or above the relief valve setting, the pressure reducer may be faulty. If the temperature is too high, the relief valve may be a combined temperature/pressure relief which is actuating properly due to temperature extremes. The reason for any such temperature extremes should be corrected.

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.

I assume you have an expansion tank attached to the cold water line leading into the boiler. I’d check that – if it feels warm all around, it’s membrane is probably faulty and the tank needs to be replaced.

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Armstrong Flow Control is a privately owned Australian company that has been servicing the valve and steam market since 1972.

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?