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help hi i have a sime halstead 30/90. ?

my boiler makes a noise like there is air trapped in the boiler the presure gauge fluctuates between 1 to 2 bars then the flame goes out any ideas guys?
paul, October 2010
possible pump problem. No circulation, so boiler cuts out on overheat.

simeservicesscotland.com, October 2010
link Click here to see other fixes for Halstead.