My husband and I tried blowing out our sprinklers this afternoon. We closed the irrigation valve (the one connected to the pipes under the street), opened the valve to the sprinkler system, and then hooked up the air compressor. We turned on the compressor & turned on the sprinkler system. The controls said Station 1 was on, but the sprinkler heads never came out of the ground. We tried every station, and nothing happened with any of them. We tried opening & closing the valves & nothing. We chec...