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thorn apollo 30/50b?

my boiler burner stays lit for between 30 and 90 seconds dependant upon pump setting. after this time, the burner cuts out and then cuts in again in 3-4 minutes. can anyone cast any light on this problem,thanks, martin
martin, December 2010
could be air lock turn off all but one rad this should do the trick

brian, December 2010
link Click here to see other fixes for Thorn.