Some DIY amateurs wrongfully assume that the sprinkler maintenance is a simple process they can carry out without seeking professional assistance. When the unit has been inactive, it is usual for different components to malfunction. a) Obstructed Ducts: Pipes could get clogged with debris or sprinkler heads might get damaged by lawn mowers. b) Uneven Watering: Results in wet patches on your property. A head or two needs to be adjusted or a valve be looked at.