heat upstairs but not downstairs Home › Forums › Public Forums › General Plumbing › heat upstairs but not downstairs This topic has 1 reply, 2 voices, and was last updated 19 years, 7 months ago by Harold Kestenholz. Viewing 1 reply thread Author Posts 31 Oct 2002 at 9:11 pm #275928 MasterPlumbersKeymaster My bi-level has two thermostats for each floor the one upstairs works fine, heat for days but I’m not getting heat downstairs I switched the thermostats but that is not the problem. I was told about zone value what is it and can I fix it 1 Nov 2002 at 12:13 am #293145 Harold KestenholzParticipant The zone valve might be the problem, they usually have handles on them to move to an open position. If that doesn’t get heat up, check the water pressure on the boiler gauge and read the Air Purge procedure at http://www.hydronicnetwork.net Author Posts Viewing 1 reply thread You must be logged in to reply to this topic. Log In Username: Password: Keep me signed in Log In