When I run Zone 6 (final zone) or any of the zones manually and then turn off - everything is O.K. Only when the "Auto" program is used to run each one does the problem occur at the BFP When the zone 6 heads re-tract - water starts to come out (in pulses) from the cover of the BFP - moments later the same happens at all of the heads in each zone i.e. small bursts of water (maybe 1/2" high)
(New to the forum - new 6 zone sprinkler system just installed) When I run any one zone and manually turn off the system everything is fine, the problem happens when I run the Auto-program - All zones work ok and everything does what it should for the right amount of time etc., but when the last zone shuts off, the water starts to "pulse" out of the top of the backflow preventer ( and also small pulses of water come out of every head in all zones). If I turn off the water at the main, the system...
