boiler cycling

Hi Wonder if anyone can help? I’m having a problem with my combi boiler, the CH keeps cycling on/off on a three minute cycle instead of modulating at the set temperature. It will fire up and ramp up to max fire before dropping back again but then overshoots the set temperature (65degC) and...

Hi all, Preface; checked and can't find this exact issue on here, but similar to this one where someone suggested 'plate heat exchanger needs cleaned /replaced'. Unlike them, however, the boiler was looked at pretty recently. Setup: -Vaillant Ecofit Pure 825 -Radiators all bled and flow...

Hi everyone, hoping there are some knowledgeable people here who can help me understand what's going on with my Wiser and boiler setup, and hopefully reassure me that it's not causing unnecessary wear and tear on my boiler... Boiler is a Worcester Greenstar 30 CDi Classic Regular ErP and I...

I had a new Viessmann combination boiler fitted two weeks ago replacing a conventional boiler. Even during commissioning it took a long time (over an hour) before the radiators finally became hot. The boiler keeps cycling and first thing in the morning it can take two to three hours before the...

I have a Vaillant ecoTec plus 618 boiler. The minimum heat output of the boiler is 4kw. I have UFH downstairs with 5 zones. Some of these zones are very small, like the utility room and the study. I think the UFH manifold is set to around 32/35°C. The house is a well insulated new build and...