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sanivite stops & starts every 5 seconds?

can a blockage make this happen
geoff, October 2011
Failed non return valve in the unit cauing back flow in turn activating the flow switch

Uncle Jim Plumbing, October 2011
could be the non return valve in the unit causing it not to sealing so the water running back into the unit from this discharge pipe causing it to activate the flow switch .

Unclejim, October 2011