combination boiler; when heat valve/pump turn on pressure zero help ?

Discussion in 'Boiler Forum' started by road, May 18, 2011.

  1. road

    road New Member

    Joined:
    May 18, 2011
    Location:
    detroit, Mi
    got a combination boiler; works however when room heat valve turn on and the pump motor turn on; pressure is still zero; temp 130; at the pump pressure goes little bit up and then to zero fast fluxtuation. vent air is coming out from air vent.
    did quick fill-water via bypass for 1 hour; still no change
    expansion tank try to drain; no water out but hear air for a while, not any more but no water out from expansion tank drain.
    expansion tank old style horizontal steel; tried open drain and air inlet from AIRTROL; nothing happen. expansion tank in bottom not hot;
    at the pump; try to drain water through shut off valve water comes; so there is water.
    any suggession ?
     
Similar Threads: combination boiler
Forum Title Date
Boiler Forum NTI Trinity 150 Combination Domestic Hot Water Issue..... Nov 16, 2011
Boiler Forum Boiler pressure problem Apr 23, 2015
Boiler Forum When is it time to *replace the boiler* Mar 31, 2015
Boiler Forum Advise on Boiler Replacement annd Sizing Mar 24, 2015
Boiler Forum Boilers groaning Mar 23, 2015

Share This Page