Aero Indirect hot water tank and Viessmann boiler problem noise

Discussion in 'Water Heater Forum, Tanks' started by ap, May 24, 2011.

  1. ap

    ap DIY Junior Member

    Feb 17, 2010
    My Aero indirect hot water heater and/or my Viessman oil fired boiler isn't working and there is a rythmic "whoosing" noise cycling on and off coming from inside the Aero DHW tank. There is a Grundfos pump on the boiler hot water feed to the DHW tank just before the tank and it "feels" like it is operating. However ithe pump gets hot even though I cannot feel any heat in the hot water feed pipe from the boiler that goes into the pump - I suspect that the high heat is from the pump running dry or ??. BTW pushing a bleeder valve on another nearby hot water feed resulted in a good stream of water.

    The boiler display has an indicator light which, according to the manual, says that it is being called for DHW BUT the boiler doesn't seem to want to fire up. I tried to reset the burner and using the override switch I got the boiler to fire for a while but it shut down after a minute or less even with the DHW light remained on.

    I am not sure whether I have a faulty hot water tank, circulating pump or malfunction on the boiler... or all three!! any one have a similar experience or recommendation. Thanks
  2. plumber2011

    plumber2011 Expert Plumber

    Jun 4, 2011
    Licensed master plumber and owner of small residen
    Boston, Massachusetts
    Last edited: Jun 7, 2011
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