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boiler is v.c.w gb 242e no green knobs i take it must be older model. i will see if i can get through to valliant technical thanks to everybody who replied dmac1

hot water hot then cold as burner going on and of instead of modulating.i mainly work on vokeras if they dont modulate to low flame it is usually flue venturi or gas pressures ;but do not know much about vailients with thanks dmac1

boiler not going to low flame on hot water

hot water not modulating boiler on then off it is a vailient 242 e any advice would be helpfull