DIY Doctor

No Heating since new pump fitted

Postby adman_lincoln » Sun Mar 01, 2009 11:49 am

Hi I have just fitted a new circulating pump and now the boiler only fires for a few mins.

I have made sure I have fitted it the right way followed venting procedures and bled the radiators.

The pump works but the hot water only seems to get to the 3 way valve then the boiler gives up. The position on the valve moves when switched between water and heating and it worked fine before pump replacement.

The reason for replacing was noise.

Any help with this would amazing.

Rank: Labourer
Progress to next rank:
Posts: 2
Joined: Sun Mar 01, 2009 11:42 am


Simply Build It

Postby plumbbob » Sun Mar 01, 2009 2:55 pm

The logical explanation is you still have air trapped in the pipework which is preventing the flow. Either crack a joint open to let out water and the air plug, or consider popping the pump in backwards temporarily to shift it.
Rank: Project Manager
Posts: 1891
Joined: Wed May 07, 2008 9:59 pm

Postby tomkev1 » Tue Mar 03, 2009 11:23 am

IT is well worth checking that you have fully opened the pump valves and not closed them.I.E that is open them in the same direction as you would a normal tap.I once had a plumber/gasman workmate of mine make the same simple mistake, took him ages to find the fault.


Rank: Labourer
Progress to next rank:
Posts: 3
Joined: Tue Mar 03, 2009 10:01 am

Postby htg engineer » Tue Mar 03, 2009 4:58 pm

Try venting the pump.

htg engineer
Rank: Project Manager
Posts: 3256
Joined: Tue May 22, 2007 5:22 pm

Postby adman_lincoln » Tue Mar 03, 2009 7:03 pm

Hi thanks it turns out I'm all bunged up with slugde!!! So now in the process of flushing the system. Either that or pay £500 to a plumber!
Rank: Labourer
Progress to next rank:
Posts: 2
Joined: Sun Mar 01, 2009 11:42 am

Display posts from previous
Sort by
Order by

  • DIY How to Project Guides
  • DIY how to tutorial projects and guides - Did you know we have a DIY Projects section? Well, if no, then we certainly do! Within this area of our site have literally hundreds of how-to guides and tutorials that cover a huge range of home improvement tasks. Each page also comes with pictures and a video to make completing those jobs even easier!

  • Related Topics