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No Heat for 2 of 5 zones

I have a Burnam V-15 boiler, the transformer went out and by the time it was replaced the house temperature was 35 degrees. Now 2 of the 5 zones won't provide heat; one on the second floor bedroom and the other in the first floor kitchen. The other three zones work fine, again one on second floor and the other on the first, the final zone is for the garage where the boiler is. The zones were checked for air--none. No frozen lines found, can't tell what is in the walls but no indication of freezing. Any advice?



  • lchmb
    lchmb Member Posts: 2,997
    zone valves?

    Need a touch more information. Is this zone valves? If so are you using two transformer's, a taco 405 box or is this circulators? When they purged the zone's did they get hot?
  • Weezbo
    Weezbo Member Posts: 6,232
    manually open the zones that wont produce heat.

    crank the temps up in all the ajoining rooms...(you may have a frozen pipe....or fitting or two....the proximity of other pipes in the wall may be enough to "Thaw them out/.check the boiler pressure....might boost it a bit too.......
  • Weezbo
    Weezbo Member Posts: 6,232
    You must be baking in there by now...!

    go back and put all the zones back on autoturn off the other zones...in about 20 mins or so have someone open the (turn up) the thermostat on one of the zones thatwas not previously working....if it dosent return cooler water then it likely isnt powered to open and close .and may be something quite simple like a loose wire depending on the type of zone valves ...it could be relatively simple to repair.
  • Frank G_2
    Frank G_2 Member Posts: 7

    The valves are open, thermostats called for heat and all valves opened automatically. Only one Taco circulator for all 5 zones, worked fine for many years, pressure is between 15-18 PSI, I cranked up the heat in the other zones but won't warm the house beyond 72 degrees, it was a cold 25 below for the last couple of days. Any other ideas?
  • Weezbo
    Weezbo Member Posts: 6,232
    if you have a control that allow you to manually turn the heat

    plant(Boiler)up and it was currently set at 150 on the boiler as a high limit i would feel turning this number up to 185 would help. are the pipes at least getting hot on the two zones ? if not id also pump the fast fill open and bring the pressure up to 20 psi.
  • Weezbo
    Weezbo Member Posts: 6,232
    boiler wining the battel aginst the cold now?

This discussion has been closed.