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how to fix my potterton kingfisher boiler cf80?

my boiler comes on to heat the water & heating but when the water is hot the heating does not continue to heat up
barbara ruddy, December 2011
Faulty diverter valve ,is room start is on high setting? To check it close hot water-cylinder start and turn on heating only on programer if nothing happens change diverter motor

ltd, December 2011
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