DIY Doctor

Replaced heat-exchanger, mixer shower hot... then not?

Postby woj101 » Sat Dec 06, 2008 8:19 pm

I had been having problems getting a hot shower for a while, but when the hot water around the rest of the home started failing as well I replaced the heat-exchange plate in my combi-boiler.

When I did this the shower was instantly hot again (even hotter than before because I'd been adjusting the thermostat in the mixer to try to solve the original issue) because the heat-exchanger had got all scaled up.

But it wasn't long before the shower started getting unreliable. You can turn it on, it gets fairly hot, then gets cool for a few minutes before maybe returning to warm/hot and then it may stay hot for the rest of the time its on. And then sometimes it might not get warm/hot at all.

When it does get warm, the temperature isn't really adjustable either (it used to be). I've tried adjusting the thermostat but it hasn't made any difference. The thermostat is like a small screw with some rubber over one end. You screw it anti-clockwise to make it hotter etc. but I don't really understand how it performs its function of regulating the temperature. Can this type of thermostat fail, or is it an issue in the main part of the faucet?

Thanks very much for anyone who reads, and especially to any input given.
Rank: Labourer
Progress to next rank:
Posts: 2
Joined: Sat Jan 05, 2008 12:52 pm


Simply Build It

Postby C23kW » Sat Dec 13, 2008 1:37 pm

you could change the diaphragm within the boiler.
Rank: Apprentice
Progress to next rank:
Posts: 20
Joined: Sat Dec 13, 2008 1:14 pm

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