We heat our second floor with steam radiators in each room. The air vent in the basement was giving off a terrible hissing sound with steam water spurting everywhere. It must’ve been occurring for a very long time because I found mold on the walls and the ceiling. We’ve been in the house for 4 years. My HVAC guy came and agreed that something was wrong with the system. He said that the pressure thermostat on the boiler was broken and was sending too much pressure to my system and that was creating the hissing sound in all of the steam. He replaced the thermostat and cleaned out my steam boiler. He told me that I have to clean my steam boiler every two weeks using a valve and a bucket. He also turned down the pressure on the new thermostat to 1 PSI. That evening we did not have any heat coming out of the steam radiators even though the thermostat was on 70°. The room never got above 63° and the radiators never got hot. I contacted my HVAC guy and he told me to turn up the pressure on the boiler a little bit. I turned it up to 2. A little bit of heat came, but certainly not enough to heat our entire second floor, and only the tops of the radiators got warm while the bottoms stayed ice cold. He came back again this morning and replaced the air vent that had previously been spewing steam and water. He said the system should work fine now, but it has been set to 70° for the last four hours and there is barely any heat coming out of any of the radiators. I am at my wits end and don’t know what to do. The system is clean and so many different parts have been replaced in this past week. Before the thermostat was changed on the boiler it was up to 9 psi and we had lots of heat and liked it. My HVAC guy said that was enough pressure to heat the Empire State Building. The Pilot is on in the boiler.

What else can be wrong???? We’re in the north east with ice and freezing temps!!!!