1
Switching valve failed
CheckListen for valve actuation at cycle interval.
FixRebuild/replace switching valve.
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2
Purge muffler clogged
CheckBack-pressure on purge; loud screeching.
FixReplace muffler.
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3
Desiccant beads broken / channeled
CheckDust in downstream filter; uneven regen.
FixReplace desiccant; install proper filtration upstream.
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4
Heater failed (heated regen type)
CheckElement resistance, contactor pull-in.
FixReplace heater element / contactor.
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Safety
Lockout/tagout before opening enclosures. Verify zero energy. Bleed system pressure before opening any pneumatic connection.