Water or moisture has been detected inside of the sprinkler. Replacement is required.
Top Causes
● The sprinkler casing may be cracked or damaged, usually at the base or riser.
● Overtightening the sprinkler to the Flex Pipe, causing a stress fracture in sprinkler casing.
● Sprinkler was hit by a lawn mower or garden tool that breached watertight casing.