Really odd issues I'm hoping an expert can help out with. I have an on-demand boiler for heat and hot water. The heat system contains two zones for forced hot water baseboard heating. About a week ago, the upstairs zone (zone 1) started staying on, putting the temp up to the 80s. I did a bit of research and found that this was likely either the zone valve itself, or the easily replacable power head. To try and troubleshoot the problem, I tried swapping the two heads. I wish I could easily recall everything I tried, but among them, I attempted to cleanup the nest of wiring and eventually picked up a new power head. Within minutes of connecting the new head, it "popped" giving a fried electronic smell and showed a distict coppery spray from an internal component and actually started smoking. I quickly turned it back off and did my best to follow a diagram to rewire everything again. Neither zone worked on it's own but could operate if I pulled both manual levers down. The head for zone 1 was staying fairly warm and I still noticed a faint smell but was unsure if it was remnants of the one that blew/smoked. Today I installed two new power heads and fired it back up. The second floor appears to be working fine now, but the first floor (zone 2) won't turn on without pulling the lever down to manually bypass the head. The basement also has a distinct "burnt electronic" smell again today after swapping the heads. I have some pictures to illustrate how it's currently wired: Power source Here, the green wire connects to both a green lead headed to the boiler and a green headed to zone 1, the white wire runs towards zone 1, and the red wire to/from the boiler heads to zone 1. Zone 1 valve Here, the green and red from the first pic connect to terminal 2 & 3 respectively. The white line connects to one side of the thermostat, and the other side connected to terminal 1. Note that a new wire here also feeds from the white line, and terminals 2 & 3 headed towards zone 2. Zone 2 valve Much like the first valve, the green lead connects to terminal 2, the red to terminal 3, and the white goes to one end of the t-stat. The other end of the t-stat is connected to terminal 1. Thanks in advance for all the help!

Hello, I bought my first house and have a question about bleeding the air from my hot water system. I been reading on the forum but first time posting. Here are the symptoms: When the heat does come on, especially at night, i hear water "whooshing" sounds, like running water and sometime some loud bangs. I checked the baseboard heaters and there are no bleed valves, only solid elbows. From what I've been reading, I bleed the air from the boiler itself when the cold season just started. I have a short hose that I use and a 30 gallon trash bin to catch the water and watch for air bubbles. To give you more background information, i had replaced the water expansion tanks (2 unit house) in October. They were water clogged, then the pressure was still too high, replaced the water regulator, which seem to fix the problem. Then the circulater pumps were leaking water, had to replaced them. Long story short, it was a lot of headaches but was able to get heat. Now after couple months, The heat is working and house is plenty warm.the noises at nigh keep me awake.. sigh.. If you need information, please let me know. Any advice would be much appreciated.