Just moved address and now got Ravenheat combi. Everything appears to be working, firing up ok, no problems with heating BUT when I need hot water at sink or bath, it comes out hot then goes cold, then goes hot, then runs cold etc. Consequently I am washing up and bathing in lukewarm water. The boiler has been repressurised a couple of times. The bar reaches 2 when heating on and then falls to 1.5 when cold. Any ideas?

Luke Warm, December 2010

overheat sensor is duff sometimes called thirmistor they are around £6 and take 2 mins to fit

phil, January 2011

thermister req changing

heatdoctor, January 2011