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fault F27 on my vaillant turbomax ?

my boiler which is covered by vaillant broke down today no ingeener available until wednesday. on the coldest days of this winter I am back to electric portable heaters.
fault F27
any ideas?
fmoulla@clara.net, February 2009
F.27 No demand to gas valve Electronic board defective; Gas valve defective

a, February 2009
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