Irrigation repairs can range from simple to very complicated. Many things that can go wrong with a sprinkler system include :
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Valves not working or staying on too long
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Heads that either stick or leak
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Mainline leaks; Service line leaks
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Rain/freeze sensors not working
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Problems with the controller
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Wiring issues; Drip irrigation problems
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Coverage issues; Clogged nozzles, etc.