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I've got a really annoying problem with my combi. Every 3/4 days I have to repressurise the central heating system as the pressure falls from 1.5bar to 1bar but I cant find a leak anywhere. With the amount of water going in it should be really obvious but I've been over every inch of pipework...

I've just tested the resistance of the thermister. At cold I get a reading of 6.50 ohms. When I turn the central heating on the resistance falls to 6.10 ohms but then rises again to about 6.35 ohms and at this level the boiler trips off. The resistance then rises again to 6.40 ohms when the...

Excellent. I've got measuring equipment. What sort of readings should I expect to see ?

Thankyou for the replies. I've ordered a Thermister as this sems to be the easiest thing to try. Do I need to drain the boiler to fit ?

Brilliant - I'll give that a try. Thanks

Thanks. I've just done a search on the LPS supplies site for Thermister and got no results. Also searched the Ravenheat RSF84 Adobe Acrobat maintance guide and couldnt find anything called a Thermister. Where do I find it ?

No only the central heating. I can run a bath of hot water without any issues at all.

Morning all, I've got a problem with my RSF 84E. When it comes on it works in short bursts of about 30 seconds before the burner turns off. It stays off for about 20 seconds and then comes on again. The rads get hot and when they are up to temperature the cycle shortens so that the boiler...

Apologies for not reading correctly. System resistance sounds a likely cause then. The system has a flow and return manifolds in microbore but its a very small pipe - I've replaced some radiators and 8mm microbore slots neatly over the original pipework so I think its something like 6mm. I'm...

Thank you for your replies. It sounds like its a problem with the system rather than the boiler itself if I read you right. I've used the original systems microbore manifolds and the original rads. Although I flushed out its concevable that there could be blockages as they are quite old. I'm in...

I never thought I could pose a question to beat you lot ... Stu :D

Morning all, I'm still having some boiler problems so thought I would come back for advice. The symptoms are that I start the heating, the flow pipe gets nice and hot, radiators start to warm up and then the boiler cuts off after a short while, restarting after about 10 seconds. The cycle...

At the risk of sounding stupid - Whats a thermister ? I've searched the PDF version of the installation manual and done a search on the LPS website and got nothing on both :?

Ok thanks. I'll let you know how I get on

Is it possible that this could be whats causing the problem ? Stu

Hello everyone, I have a Ravenheat RSF 84 combi in my house. The hot water works perfectly but when the heating comes on the boiler works in short bursts of about 2 minutes, before turning off for about 30 seconds. The rads get nice and hot and all seems to be well but after this cycle...

Certainly did. I was lucky enough to be given the roof vent free when I bought the boiler. Stu

Ok point noted. I only ran it for a minute though. Just to let everyone know that I've managed to re-route the flue so it now goes straight up through the roof, works perfectly. Thank you very much for all your help. Stu

That might be the issue. I've got 3 90º elbows and I never counted them as distance. Is there anyway I could get this arrangement working ? Stu

Just to let you know that although I've got a flue problem to solve, the heating now works fine and the water is flowing well. Appreciate the help. Stu