Hi

Hope somebody can help

I have a Protherm 80e combi boiler. In the last two day's the central heating has only heated the rad's so that they are not cold. Saying they are warm would be stretching the truth. The boiler runs ok but when the display hit's 41 the boiler stops heating. When it drops to 28 the boiler automatically starts heating again.

The problem only applies to the heating. The water from our hot taps is very hot and the boiler automatically comes on when a hot tap is turned on so no problems there

I did clean the secondary heat exchanger which had some dirt (back water) in it which I could hear rattling around before hand. The only difference this made was make the tap water hotter.

Would anybody have any idea what else could be wrong???

Thanks in advance for any suggestions offered

Vinnie, July 2008

Have you tried replacing the ch thermister? it could be gone faulty....

T, July 2008

Thanks John, water from radiators is clear. should I look at the pumb etc..although it sounds like it's working ok.

Vinnie, July 2008

I think that there is a good chance of your system being thoroughly sludged.....bleed some water off from a radiator or two - if the water is black as before, it indicates significant magnatite deposits.

John, July 2008