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Having a enjoyed a lovely couple of weeks of fully functional boiler and delicious hot showers, it's up to it's tricks again! So to recap.....Ravenheat CSI 85T... in the past couple of months has had a new pump, new heat exchanger, new diverter valve and thermistors....... Woke this...

I have been having problems with my Ravenheat CSI 85T boiler for some time... boiler cycling on/off when running DHW. First fix (about a year ago) - replaced both thermistors.... seemed to do the trick for a while Then it started all over again.... only worse... and suffered...

2 year old Ravenheat condensing boiler... hot water cuts in and out. The boiler can be heard firing up and the water starts to come hot... then the boiler can be heard to cut out... and it goes cold. This problem has been getting worse over the past few weeks. Initially, the boiler would only...