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What should you do first if a sprinkler won't shut off?

  1. Adjust the sprinkler heads

  2. Contact a technician

  3. Shut off the mainline

  4. Check for leaks

The correct answer is: Shut off the mainline

When a sprinkler won't shut off, the most immediate and prudent course of action is to shut off the mainline. This is essential because leaving the sprinkler system running can lead to water waste, potential flooding, and damage to the landscaping and surrounding areas. Shutting off the mainline immediately stops water flow, allowing for a safer assessment of the situation. Once the water is turned off, you can then investigate further for the underlying issue, such as checking for leaks, adjusting the sprinkler heads, or contacting a technician if necessary. This step-by-step approach prioritizes safety and minimizes damage, making it the logical first step in addressing the problem effectively.