1
Inlet temperature too high
CheckInlet should be < 100°F (38°C) — verify against dryer nameplate max inlet temp; as a rule of thumb roughly every 20°F (11°C) rise in air temperature approximately doubles its moisture-carrying capacity, overloading the dryer.
FixAdd aftercooler upstream; reduce ambient temp.
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2
Condenser dirty (air-cooled)
CheckVisual; head pressure high.
FixBrush/blow out condenser fins.
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3
Refrigerant low
highCheckSuction/head pressures vs spec; sight glass for bubbles.
FixFind leak first; recharge with correct refrigerant.
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4
Hot gas bypass valve out of adjustment
CheckEvaporator outlet temp swinging.
FixAdjust HGBV per manual.
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5
Heat exchanger fouled internally
CheckΔP high; performance drops despite refrigerant ok.
FixChemical clean or replace exchanger.
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Safety
Lockout/tagout before opening enclosures. Verify zero energy. Bleed system pressure before opening any pneumatic connection.