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OK thanks,during me trying to fix problem,I turned the yellow lever,but turned it back to original position,would this have anything to do with it? If so how can I rectify it,or as you suggested will it still be valve

yes the CH and hw lights come on when selected that's when can hear ignition trying to start,a clicking noise,lasts about 10 seconds then back to flashing red 01

Thanks again for your help,think I,ve over turned the bit on PCB board as when control knob on reset it tries to start,can you tell me where and what isolation valve looks like

Help needed again,took off PCB board and turned the thing 180,the red flashing 01 has stopped but the boiler trys to start and after no ignition the red 01 comes back on, can hear pilot trying to start .but like there's nothing there but once turned back to reset the pilot still tries to ignite...

It was me who replaced control knob,thought because D shape there was only one way for it to fit,it has been working for two months but when I move knob co does show briefly

Have recently replaced mode selector knob, so shouldn't be that but have ordered another one just in case thanks to everyone for their help

Still keep s flashing red 01 it doesn't go away at all

Can anyone help,my gas credit meter ran out when my vokera lines 27 was on,I put credit into meter,boiler error code 01 flashing red which means I turn mode selector switch to reset Wait s minute the 01 flashing non stop when switch in any position, have turned off at wall.gas fire working so...