Why does 6kw sauna heater blow rcd

Postby pstevdata » Thu Jan 15, 2009 3:00 pm


I have just had an electrician fit a new consumer unit for me. This has a RCD and 32 amp fuse.

I have wired a 6kw sauna heater in to this and the heater unit comes on for about a couple of minutes and then the rcd trips out.

If left for a few minutes you can repeat the process but the heater will not stay on

Can anyone offer any suggestions.

Rank: Labourer
Progress to next rank:
Posts: 2
Joined: Thu Jan 15, 2009 2:55 pm


Simply Build It

Postby TheDoctor4 » Thu Jan 15, 2009 5:20 pm

Last year 64% of the questions asked in our forum were answered within our DIY project pages at www.diydoctor.org.uk/projects.htm. The project pages are now separated alphabetically and your answers are accompanied by diagrams and the ability to see, and buy, the tools and/or required to complete your project. Use our search box to look for your answer and save a great deal of time and money!
Rank: Project Manager
Posts: 16777215
Joined: Tue Jul 24, 2007 9:12 am
Location: Somerset in the UK in Shepton mallet

Postby sparx » Thu Jan 15, 2009 6:31 pm

Hi, if the heater has not been used before or for a long time, the elements which are hygroscopic will have become damp so causing the earth leakage problem.
A good electrician should know ways around this, such as wiring heater temporarily via a none RCD supply and leaving on for some time to drive moisture out.
There are other ways which should only be done under strictly controlled conditions which I will not go into on public forum as they are potentially dangerous in wrong hands but which will work.
Gonna have to get your part-p leckie back to help i'm afraid,
regards SPARX
Rank: Project Manager
Posts: 2166
Joined: Wed Mar 21, 2007 8:33 pm
Location: The fifth continent.

Postby pstevdata » Fri Jan 16, 2009 9:04 am

Thanks for the quick reply SPARX

I had read about the damp in the elements somewhere else on web. That is why I had persevered with turning on and leaving for a few minutes, but it doesn't appear to be generating enough heat to dry these out.

As you suggest they probably need to be dried throughly.

Really appreciate your advice.
Rank: Labourer
Progress to next rank:
Posts: 2
Joined: Thu Jan 15, 2009 2:55 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