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my potterton combi boiler wont heat the radiators?

my boiler heats the water but every time i put theheating on it locks out-the hot water only gets about an inch down the out pipe before it shuts down
julian, December 2007
Is the pressure at between 1 and 1 and half...?
Look at the Presure gauge on your boiler.
Vent all rads and put pressure to 1 to 1 and half.

The best plumber around, May 2008
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