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Under the hot water control knob there is a potentiometer to adjust what my instruction book refers to as The ignition heat output(soft light ignition).Can any one tell me what this means please. Thanks.

I have a Vokera Excell 80E.Can get no hot water when the selector in on the water setting.The red flue diagnostic light keeps flashing.Have checked the flue is clear and the fan is working.Can get hot water if I switch the selector switch to central heating and switch on the heating...