vailant ecotec

Hi Ecotec Plus 831 HW only luke warm, CH working fine. When running HW, flow pipes do not get warm. Diverter valve has been replaced (probably unnecessarily). When running HW, burner starts, temperature rises few degrees above setting then burner cuts out, temp falls then burner continues on...

Hi All, I recently had an issue where the boiler turned off due to low pressure in the CH circuit. I have since found that the pressure vessel diaphragm had failed so I put in a new one and pressurised the air side to 1 bar. This has not fixed the issue. When the boiler is heating it will go up...