Safgard 1150 LWCO question

MaxMercy · February 25

My brother in law called me for no heat on his oil fired boiler. There was no power to the burner and I traced it back to the LWCO, a Safgard 1150. The yellow low water light was on but the boiler showed about 10lbs of pressure with the temperature below 70F, so I think he's got enough water over the boiler.

I jumped out the cutout and the boiler fired. I ran it a few minutes while I looked up the manual for the Safgard and the yellow light on the Safgard went out, so I removed the jumper.

I didn't remove the sensor because I didn't have any tools on me save for my meter, but my question is whether the sensors in the cutoffs go bad or if they need any kind of periodic cleaning. I left him with heat and the LWCO in place but I know if it tripped once it's either bad or there's low water (no leaks found).

Ideas? Thanks.

ScottSecor · February 25

We have seen the probes fail. Much more often we find the probes are dirty, often covered with rust or a silt like substance. I would start with draining the boiler and removing the probe, if dirty clean it and re-install.

ScottSecor · February 25

Jamie Hall · 12:18AM

But don't use pipe dope or tape on the probe when you put it back in. It must have a good ground connection from the probe to the boiler and thence to building ground.

techforlife · 1:35AM

As long as you know that the water content is appropriate, since it is a hydronic boiler, replace the entire LWCO. Steam can dirty up the probe but unlikely on hydronics. Electronics get intermittently unreliable all the time.

Safgard 1150 LWCO question

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