Home Improvement Questions? Ask a Handyman for Answers
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You could have a leak in the line feeding the heads or the solenoid may not be opening completely (or it's clogged).
The first thing to try is to take the solenoid apart, flush it out and rebuild the valve. If that doesn't work then finding a leak in a buried irrigation line is probably best left to a leak detection company. There's no way a homeowners is going to find it unless you dig up the entire line or the leak is so bad you see water ponding on the lawn.