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Hot water on and off?

vaillant turbomax 824 when i open hot water tap hot water do not com for some time then arrive as a on and off not continusly heating is fine diyvarter and hot water sencor is changed some body can help Thanks
nas, November 2008
Check hot water plate heat exchanger internal pipework in it has sediment in it and is not transferring the heat

a, November 2008
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