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Pressure Relief Valve Opens
On Friday and again this morning, my Weil Mclain (Model SGO-Series 2) steam boiler's pressure relief valve went off. When it happened on Friday, I replaced it and it was OK over the weekend, but it went off again this morning. The relief valve is specified at 15 lbs, but the pressure gauge on the boiler only showed four pounds of pressure, which is typical for this unit. It's working again at the moment, but something is up with it! Anyone have any suggestions as to what the problem might be?? Thank yo.