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how can i make my central heating stay on?

I have a greenstar highflow 440 boiler. the red alarm light is on constantly and i cannot override it When I use the restart button the central heating will run for about 10 mins then cuts out. the hot water is ok.
Sue Fletcher, February 2011
The red warning light is usually associated with a dirty sensor in the gas ignition system, so that correct combustion is not being recognised. The sensor needs a quick clean if you can get access to it.

Iengine, February 2011
link Click here to see other fixes for Greenstar.