DIY Doctor

rads hot at top

Postby Penrhyn » Sun Jan 04, 2009 12:36 pm

Some of our radiators are hot at the top and much colder at the bottom. The ones on the upstairs seem to be OK, it's just the ground floor.

I've checked the header tank and bled radiators. I can't bleed the whole system as we have an air diverter (correct name?). The pump has recently started to make a ticking noise but does seem to be working OK.

We have a conventional Potterton boiler system with a bypass as we have TVRs on all radiators.

Any advice appreciated as it's cold here!


Rank: Labourer
Progress to next rank:
Posts: 1
Joined: Sun Jan 04, 2009 12:30 pm


Simply Build It

Postby Steve the gas » Mon Jan 05, 2009 5:22 am


Rads cold at the bottom indicates sludge in the system.
This will make your pump struggle.
Solution (depending on your skill set) is drain & flush a few times, add cleaner for the required period, drain again > add inhibitor.

Failing this get a good recommended firm to powerflush it (£300 +)
but not BG.
Steve the gas
Rank: Site Agent
Progress to next rank:
Posts: 780
Joined: Sun May 04, 2008 7:07 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