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diverter valve problem?

can someone tell me the symptons of a diverter valve failing. thanks
Dave, November 2008
If the boiler is calling for heat and the diverter valve has failed you will see a lever on the side of the valve.If you push this and find a resistance then the synchron motor inside the valve has shot and needs replacing.

Tony S, November 2008
If on a combi boiler normally no hot water

a, November 2008