Odds are that dirt has gotten into the new heads and is blocking the filters. Unscrew the spray head right at the top of the riser (the part that comes up out of the sprinkler body), take out the white plastic filter (may need to use a needlenose pliers), rinse out. Run that zone for a minute or so with the spray head off, to flush dirt out of the line. Put the spray head back on and should work.





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