Why would my sprinklers have anything to do with my washer filling with water. When we turn the sprinklers off it doesn't fill. When there on it fills. Weird

Defective inlet solenoid on the washer... sprinklers causing surges on the water line and the surges are pushing water past the solenoid?

When the sprinklers are on does the washer fill normally and then shut off? Do any other fixtures affect the washer? Smoothy
Has a good point. The spring in the solanoid has to be weak to allow surge to open it up. Cheers, Tom