So you think you have fan/air pressure switch problems. Google 'Vokera flue Venturi'. Small amounts of dirt on the flue Venturi also give rise to the differential air pressure switch not working reliably. Download the manual from the Vokera web site, find the venturi (page 2, connected by silicone tubes to the APS)and suggest to your gas man that he might try extracting the venturi from the hood and giving it a very thorough clean with a small needle file to remove any encrustations/dirt. May do the trick. Your gas man might try connecting a multimeter (careful, mains volts) across the APS to monitor operation/verify the problem.
The Venturi/fan/heat exchanger should all be properly cleaned in a regular service. If cleaning the venturi does not help he could try phoning Vokera's technical help line for free advice before ordering the ignition control box.
Its well worth getting a Vokera specialist to do the regular service of your boiler, as he will know all the quirks of the make/model.
c
May 2007
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