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my rsf820/20t keeps cutting out after a minute?

my boiler keeps cutting out after a minute and i have to keep relighting it i have replaced the pump for new one can you give me some ideas,i thought it might be fan or overheat cut off thermostat
dale, June 2012
cutting out after a minute
sounds like overheating
can you hear boiler hissing just before it cuts out?
i would check gas pressures & temp diffs on flow & return pipes first

AWOL, June 2012