new pump, but not getting hot water to circulate to radiator

Discussion in 'Plumbing and Central Heating' started by macnab, 30 Mar 2009.

  1. macnab

    macnab

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    Hiya, any help appreciated, old pump burnt out, so replaced with new grundfos! whole system drained and bled, but hot water still wont circulate to radiators, bathroom radiator closest to boiler get's slightly warm and that's it, arrrghh! help a lady in distress, it's doing my bonce in..
     
  2. Soggy_weetabix

    Soggy_weetabix

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    Clear the air properly.

    I presume you replaced the pump valves if you drained the system?

    If you did, are they open fully?

    Dave
     
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  4. glasgowgas

    glasgowgas

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    switch off heating system. now fill and vent all your radiators including hot water cylinder (if fitted). on your new grundfoss pump remove the vent plug (on the face where the writing is) when water dribbles out place a cloth to catch and replace vent plug. if you dont vent the pump it can air lock very easily. now try running your system
     
  5. macnab

    macnab

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    Thanks guys, will see what happens, return flow seems wrong, there's gotta be air somewhere, sounds like it might end up being a hosepipe flush job!! Will keep you posted!
     
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  7. kevplumb

    kevplumb

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    the pump is of course the right way round :?:
     
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