(206) 949-5683, Top Rated Plumber, Seattle
Results 1 to 15 of 15

Thread: 2 zone system-no heat upstairs-Boiler doesn't fire when that zone asks for heat

Threaded View

  1. #1
    DIY Junior Member MrBostn's Avatar
    Join Date
    Dec 2010
    Boston. MA

    Default 2 zone system-no heat upstairs-Boiler doesn't fire when that zone asks for heat


    Glad I found this forum. Perhaps someone can assist me.

    2 zone system. Gas fired-forced hot water (not baseboards but air handlers-one in basement and one of 2nd floor)

    3 circ pumps-and a taco controller. zone 1 works, the hot water system works-all 3 circ pumps turn on.

    Zone 1-everthing works fine
    Hot water heater works fine
    Zone 2-turn on heat, set hallway thermostat on 90F, pump circ starts, air handler upstairs starts and blows (cold) but the boiler never starts up.

    I thought it may be air in the system so turned th the valves in the 2nd floor airhandler to release any air, but no air came out-

    The zone 2 thermostat when turned to heat kicks on the blower in the 2nd floor-can anyone tell me how does the air handler tell the boiler to start? Could that be my issue?

    Zone 1 kicks in the Burnham boiler
    Zone 2 does NOT start the boiler.

    I swapped zone 1 with zone 2 relays in the taco but that didnt work?

    Last year I had what I thought was the same issue-no heat upstairs-I called a random plumber. He and his partner came-(I didn't watch) said the released the air from the system. Heat worked when they left. This year, same issue-I found the valves-turned them-uneventful. No air hissing.

    Any ideas?
    Thank you
    Last edited by MrBostn; 12-07-2010 at 09:00 AM. Reason: additional info

Similar Threads

  1. New third zone always radiates heat
    By mainemom in forum HVAC Heating & Cooling
    Replies: 2
    Last Post: 06-22-2009, 11:45 AM
  2. No heat in one zone
    By DipStik in forum HVAC Heating & Cooling
    Replies: 5
    Last Post: 01-16-2009, 08:39 AM
  3. Little heat in one zone
    By joslinm in forum HVAC Heating & Cooling
    Replies: 0
    Last Post: 11-23-2008, 11:51 AM
  4. Adding a zone to my Hot water heat system
    By rockycmt in forum HVAC Heating & Cooling
    Replies: 3
    Last Post: 11-15-2007, 08:15 AM
  5. heat rising to second floor in 2 zone hydronic system
    By magicalpig in forum Plumbing Forum, Professional & DIY Advice, Tips & Tricks
    Replies: 1
    Last Post: 04-06-2006, 09:31 PM


Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts