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how can i fix?

my 15cbi bosch/worcester boiler that comes on for about 30mins then locks out i manually reset the flashing light and it fires up again but only for about 5mins each time! The pattern just repeats itself each time! Has anyone any suggestions? Thank you.
Gaz, August 2011
try replacing the thermister/s on ch flow and return pipes. they can go out of range sometimes.

plumb bob, August 2011
link Click here to see other fixes for Worcester.