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there may be a problem with the central tube in the old valves - they were prone to coming loose, which would interfere with the solenoid operation - you can remove the solenoids from the problem valve and a working one, and compare the position of the top of the tuube - too high, and the valve won't openThanks for the information. I was able to re-build the valves with new solenoids and diaphrams from Irritrol 2400 parts. Everything worked fine -- for about a month. I have one valve that will not automatically start. If I open the bleed valve a bit, that zone will come on. I have even gone to the trouble of switching lids, solenoid and diaphram from one zone to another. Now the zone I switched it to will not start. Tried a new solenoid. No luck. Is there something with the lid? I thought I cleaned everything well before re-assembly.