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hello all valor ultimate pilot light works fine and stays on but when the control knob is turned to low or high fire goes out as i have said pilot light works fine any ideas please

vaillant vcw gb 242 eh hot water working most of the time / central heating however comes on for ten seconds and then red neon light locks out, temp rises very rapidly and pump gets very hot. Recently changed heat exchanger, diverter valve diapragm and water valve diapragm, Servo valve working...

Hi to all can any body tell me if the vaillant vcw gb 242 eh water valve diaphragm has a hole in the centre as there are two types one with one without but they are identical in size..... thanks stumpey

Hi to all problem is on a vaillant gb 242 eh hot water works ch comes on for about ten seconds then goes off temp rises very fast and pump gets very hot diverter valve seams to work going out for hot water comes in for ch have set micro switches and servo valve as service manual states...