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House Heating system: Mini Gas Low Pressure Boiler

I have 4 Thermostats in the house (1-Master Bedr, 1-Kids room, 1-guest room, 1-living room) All 3 rooms are generating heat exept in the living room. The living room have 7 baseboard and only 1 of them is generating heat

what would caused the other baseboard to not generate any heat? I check the crawl in, and I can visibly see all the pipes running to each baseboard and i don't see any leak and none of them are warm/hat to touch

  • Where are you on this planet? Also, we're talking hydronic here right? – ThreePhaseEel Oct 20 '17 at 22:25
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You may have an air lock. Any air in the system will keep the water from flowing. Your system and BB's should have little air vents to vent the air. Investigate these air vents (sometimes called "bleeder valves") and what they look like on-line and then start looking. Under your hinged end covers you should find these mini air vents. They usually take a flat blade screw driver to open. Turn the top slightly to the left. It should spit and sputter air and water. Once the air is gone and you only have water coming out close the vent and go to the next one. Once all of the air is out of the system, the water will move and bring heat to the area. (Look up air vents for hydronic heat systems, sometimes called key vents.) Also turn up the water pressure on you system. It should be around 10 to 12 psi. You have to have some water pressure in the system to drive the air out.

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