Hi everyone, looking for some help here since I've contacted 3 professionals over the past 2.5 months without a response from any of them to come do some work on my electric hot water boiler. I have a Slant/Fin Monitron EH hot water boiler system with a 3-zone system. In December I had someone come look at it because it was constantly bleeding water from the relief valve (filling a 5 gallon bucket every 2-3 days or less if it was colder). He looked at it, and determined that it was installed improperly and needed a change in set-up. He drained my expansion tank which was full of water, and the dripping has since stopped. A new issue arose however, where it basically sounds like my house is a raging river. I've compared my pictures to the diagram and can't seem to determine the problem, but I've included some pictures. I have noticed that I don't seem to have a "diaphragm compression tank and fill valve" as per the installation diagram, and it instead looks like the water is piped directly into the system. I'm not having any issues with the zones or the producing heat (other then being inefficient) but just the fact that there is a lot of air getting into the system somehow. I've checked the expansion tank which is situated above the boiler itself and it is always hot (as if it's pumping excess hot water into the expansion/overfill tank rather then the system). Any help would be appreciated, and if you need more pictures let me know. expansion tank above the boiler [ATTACH]47291[/ATTACH] Temp/Pressure gauge when on [ATTACH]47295[/ATTACH] circulator heading into the bottom of the system [ATTACH]47292[/ATTACH] Three zone set up, literally just hanging out in the middle of this room occupying a fair amount of space. [ATTACH]47294[/ATTACH] [ATTACH]47297[/ATTACH] Apparently it won't upload the picture of the inflow, but you can see it at the right side of the picture of the monitron itself. The bottom pipe heading up leads to the expansion tank, the middle out to the rest of the system, and the top is the inflow from the city water.

My oil burner has 3 zones and 3 separate circulators. 2 of the zones work fine: when heat is called for the circulator starts and the furnace ignites. When the third one calls for heat, the circulator starts but the furnace does not ignite and I can watch the temperature go to zero as the water is circulated through the radiator of that zone. When a thermostat in another zone calls for heat, the furnace starts and the water heats up normally and I get an error code: flame out of sequence. The oil primary control is a Honeywell R7284. I have replaced the thermostat in the problem zone so it is not that. What should I look at next? Thanks