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water runs hot then cold?

we have just had new gas valve,and harness fitted on our heatline30 combi,by british gas. since then our hot water keeps going from hot to cold. could it have any connection with work just carried out. any suggestions please.
flow, March 2010
then get BG back

hi-spec plumbing & heating (essex), March 2010
link Click here to see other fixes for Heatline Caprio 30.