The VOKERA OPTIONS type boiler is failing to produce heat/hotwater. The timer is fully functional as far as i can tell, however, the pilot warning light (bottom, centre of panel) is flashing red. Can i mend this manually or is a professional required?
you could try some of the suggestions in the users intructions manual, or the installation and servicing manual. both available to download as pdf files from www.vokera.co.uk, click on product selector or literature, and select your boiler type.