Trips on high temp or runs near shutdown setpoint.
1
Low oil / coolant
CheckSight glass at correct running level (typically middle of glass).
FixTop up with OEM-spec oil. Do not mix oil types.
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2
Dirty cooler fins
CheckVisual; ΔT across cooler unusually low.
FixBlow out fins, clean condenser, check ambient airflow.
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3
Fan failure / wrong rotation
CheckVerify rotation, check fan motor current.
FixCorrect rotation (swap 2 phases), replace fan motor.
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4
Thermostatic valve stuck (screw)
Rotary screw
CheckMeasure inlet/outlet temps across oil cooler — should equalize once warm.
FixReplace TV element/cartridge.
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5
High ambient / poor ventilation
CheckRoom temp + airflow. Max ambient typically 100–110°F (38–43°C).
FixDucting, louvres, dedicated room fan.
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6
Failing oil filter
CheckDifferential pressure indicator on filter.
FixReplace filter element.
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7
Oil cooler internally fouled
Rotary screw
CheckPersistent high temp despite clean exterior and new TV.
FixChemical clean or replace cooler.
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8
Worn airend
highRotary screw
CheckDischarge temp rises over years even with maintenance.
FixAirend rebuild/exchange.
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Safety
Lockout/tagout before opening enclosures. Verify zero energy. Bleed system pressure before opening any pneumatic connection.