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Re: Reasons for non-functional piston?
Try taking the air lines out of the offending piston and triggering the solenoid without them in. If the air switches sides like you expect it to, you have a plumbing problem or an air pressure problem (or no problem at all). If the solenoid doesn't switch sides when you expect it to, you have a wiring problem, a code problem, or a underpressure problem (like Joe said).
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The mind is not a vessel to be filled, but a fire to be lighted.
-Plutarch
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