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Glow-worm compact 80 combi boiler hot water problem?

The above boiler when the hot water is swithed on it starts of warm but then goes cold ,what might cause this and how can i fix it?
Silvano, February 2010
Is this not a diverter valve?

Kevin, October 2011
Lol me to hot water for 1 mins then cold for 1 this on a constant cycle and it's doing my head in, exactly the same with the heating to . spent loads to heating engineers but never helped anything

bazza, March 2010
i have the same problem too! does yours make strnage sounds too when its off??

ricky, February 2010
link Click here to see other fixes for Glow-Worm.