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Vokera compact boiler, water not heating up?

my Vokera compact boiler starts up fine when hot water is called for but before the water gets warm/hot the burner stops for a few seconds and then starts again. This pattern is repeated constantanly. I have checked the tube to the air pressure switch and that is clear and fine, any suggestions.........

Charles
October 2008
try the domestic hot water thermister

jimmy1955
November 2008
sounds possibly like minimum gas setting is not set
10.1mbar high 1.9mbar low

steve
October 2008
Check the electrical output of the air pressure switch carefully with a multimeter (careful -ac mains present). If it is tripping out the venturi needs cleaning (not the silicone tubes, the venturi section). >>This is a job for a Corgi man

c
October 2008

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Mend Heating, Home Heating Systems
Free repair help for Vokera home heating systems