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Boiler works but doesn't get CH to required temp?

My Alpha 240E boiler will produce hot water and some heat for central heating but it goes on for a bit then stops, so temp in the house is 16 deg C not 20 deg C. Any suggestions much appreciated..
PeteW, February 2006
After two visits from the boiler man this turned out to be a worn out temperature sensor. An easy job to fix but an overall £120 in call outs.

Peter Wake, April 2006