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error code 28?

my ravenheat boiler heating works okay.. but when i put hot water on after thirty secs the digital code 28 flashes up and the water goes cold..any ideas please
lee lee, July 2010
i meant flue sensor

Andy, January 2017
I had that problem and it was the flue sension, part number 0007SON11035, £15 on ebay.

Andy, January 2017
link Click here to see other fixes for Ravenheat RS28.