Gauge hunts up and down instead of holding a steady band.
1
Pressure transducer drifting or failing
medCheckCompare the controller reading with a calibrated test gauge at the same tap through a full cycle.
FixRecalibrate or replace the transducer; check for a blocked sense line.
ToolsCalibrated test gauge
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2
Undersized receiver for a spiky demand
medCheckLog demand events; compare receiver volume against ≥1 gal per CFM (4 gal/CFM for variable load).
FixAdd receiver capacity, ideally near the large intermittent user.
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3
Modulation / capacity control set too narrow
lowCheckReview the load/unload band — screws normally use 8–10 PSI, recips 10–20 PSI.
FixWiden the band to OEM values.
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4
Faulty downstream regulator hunting
lowCheckIsolate the branch regulator and watch header pressure stabilise.
FixRebuild or replace the regulator; fit one sized for the actual flow.
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Safety
Lockout/tagout before opening enclosures. Verify zero energy. Bleed system pressure before opening any pneumatic connection.