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Hi Please help ! Boiler fires when hot water tap is opened but the flame knocks off after 30 seconds or so. Diverter vale and the micro switch works fine. cleaned the flame section, bled the sysytem. Checked the dHW expansion vessel (the small spherical vessel with the valve) nopressure is...

Original problem for which I received valuable advice, (Many thanks) was fluctuation in the pressure and CH not firing after even 25 attempts after an idling (cooling) period of about 5 mts. Following the advice I pressurised the CH expansion vessel to 13 lbs (.9 bar) and bled the boiler and the...

Please Help ! My Vaillant 242 EH is giving problems again. HW works well. When CH switched on fires and rums well until rads are warm. After the first cooling period it tries to fire up, up to 25 times but the flame does not catch on and stay and after 25 attempts the lock out jumps out...

Model VCW GB 242 EH, about 15 years old, DHW works well, CH working but not warm enough. boiler fires when CH switched on, blue flame but stays low only about an inch tall and goes off when temperature reaches 65 degrees c on the meeter. Refires when the temperature drops down to 40 degrees...