Tools rusting; pneumatic actuators sticking; air-tool icing.
1
Dryer not operating
CheckRefrigerated: dewpoint reading 35–50°F. Desiccant: tower-switching cycle ok?
FixService dryer per type.
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2
Aftercooler/separator drain stuck
CheckPop test the drain manually.
FixService drain valve; replace if electronic timer failed.
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3
Demand exceeds dryer rating
CheckCompare dryer SCFM to actual flow.
FixUpsize dryer or stage with second unit.
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4
Bypass valve open
CheckTrace piping; many installs include a dryer bypass.
FixClose bypass when dryer is online.
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5
Coalescing filter element saturated
CheckΔP > 5 PSI across filter.
FixReplace element.
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Safety
Lockout/tagout before opening enclosures. Verify zero energy. Bleed system pressure before opening any pneumatic connection.