Sullivan-Palatek Compressor Alarms: Fix Guide

Sullivan-Palatek Compressor Fault Codes — Quick Reference

Sullivan-Palatek compressors use electronic controllers that display fault codes and shutdown alarms related to temperature, pressure, motor overload, and sensor conditions. Models include rotary screw and reciprocating units used across industrial plants and contractors.

Safety Before You Start

Sullivan-Palatek rotary screw compressors combine line voltage, pressurized air and oil, and hot surfaces. Take these precautions before opening any panel or fitting.

• Lock out and tag out the main disconnect before opening electrical enclosures or working on the motor, following your site’s LOTO procedure and OSHA 29 CFR 1910.147.
• Fully vent the receiver tank and separator vessel before loosening any fitting or cover. Confirm the pressure gauge reads zero rather than assuming the unit is safe just because it stopped running.
• Let the airend, oil cooler, and discharge piping cool before working near them. Discharge temperatures in normal operation often exceed 180°F.
• Never open the oil fill port or separator tank while the system is pressurized. Oil under pressure can spray and cause burns or eye injury.
• Keep hands and loose clothing clear of the drive belt, coupling, and fan whenever the unit has power, including during unattended auto-restart cycles if enabled.
• If you are not trained on compressed-air systems or unsure how to safely isolate stored pressure on this model, stop and call a qualified technician.

Tools You Will Need

• Digital multimeter for voltage, phase balance, and continuity checks
• Pressure gauge or manifold set to verify differential pressure independent of the controller display
• Compressed air source and blow gun for cleaning cooler fins, with eye protection
• Infrared thermometer for discharge and cooler surface temperature checks
• Sullivan-Palatek controller manual for the exact fault text and setpoints on your model
• Clamp meter for measuring actual motor running current under load

Most Common Faults

High Discharge Temperature

Discharge temperature shutdown is the most common fault on Sullivan-Palatek rotary screw compressors.

1. Confirm when the fault appears: at startup, under steady load, or only after extended run time. This timing helps separate a cold-start issue from a cumulative heat problem.
2. Check the oil level first, with the unit stopped and using the sight glass or dipstick reference for your model. Low oil reduces both lubrication and cooling capacity together.
3. Clean the oil cooler core with dry compressed air applied against the normal airflow direction, pushing debris back out the way it came in rather than deeper into the fins.
4. Confirm the cooling fan spins freely and reaches full speed. A fan that spins but moves noticeably less air than normal, from a weak motor or worn bearing, is easy to miss on a casual glance.
5. Check the compressor room’s ambient temperature and ventilation. A hot, poorly ventilated room can push discharge temperature past the trip point even with clean equipment.
6. Measure discharge temperature with an infrared thermometer at the airend outlet and compare it to the controller’s displayed reading. A large mismatch points to a sensor problem rather than a real overheat condition.
7. If oil, cooler, fan, and sensor readings all check out, the airend itself may be generating excess heat from internal wear or misalignment, which needs professional evaluation.

Motor Overload

1. Verify incoming voltage on all three phases with the compressor running under load.
2. Check voltage imbalance between phase pairs. Imbalance above roughly 2 percent causes a much larger current imbalance in the motor windings and can cause repeated nuisance trips even when average voltage looks fine.
3. Review demand on the compressor. If it runs fully loaded continuously rather than cycling with the plant’s actual air demand, confirm the motor and compressor are correctly sized for the application rather than assuming a component failure.
4. Inspect the motor, coupling, and belt drive for binding, misalignment, or bearing wear adding mechanical load.
5. If voltage, phasing, and demand check out, have a qualified electrician verify the overload relay setpoint against the motor nameplate and measure actual running current with a clamp meter.

Low Oil Pressure

1. Check oil level with the unit stopped, using the sight glass or dipstick location specified for your model.
2. Inspect the oil filter condition. A clogged filter on a cold start will trip low oil pressure before the oil warms and flows freely, especially in cold shop conditions where oil viscosity is higher.
3. Replace the filter if it is past its service interval, even if it does not look visibly plugged, since internal restriction is not always visible from outside.
4. If oil level and filter are both fine, inspect the oil pressure sensor and its wiring for corrosion or a loose connector.
5. If pressure still reads low on an independent gauge after all of the above, the oil pump or internal lubrication passages may need professional inspection.

Sensor Fault

1. Identify which sensor triggered the fault: discharge temperature, oil temperature, or a pressure transducer are the most common.
2. Inspect the sensor’s wiring harness for corrosion, chafing, or a loose connector, especially near vibration points.
3. Where practical, compare the sensor’s reading to an independent measurement using an infrared thermometer or calibrated gauge.
4. If the sensor reads open or shorted on a continuity check with the harness disconnected, replace the sensor.

Emergency Stop

1. Physically inspect and reset the E-stop button, confirming it releases fully to the reset position per its design.
2. Check any door or guard interlock switches wired into the same safety circuit for a door left open or a misaligned switch.
3. If the fault will not clear after confirming all E-stops and interlocks are reset, the safety relay or its wiring may have failed and needs professional diagnosis.

Parts Often Needed

Need Replacement Parts?

Before ordering, match the commercial equipment part to the model number, electrical rating, and failure symptom. Check current prices on Amazon - prices and availability change frequently.

Jump to Fix

• High temp fault → Check oil level → Clean cooler → Verify fan operation
• Motor overload → Check voltage balance → Reduce demand → Check motor amps
• Low oil pressure → Check oil level → Replace filter → Inspect oil pump

When to Call a Pro

Repeated temperature or pressure faults after routine service often indicate airend wear or cooling system failure that requires a qualified compressor technician. Call one when:

• High discharge temperature persists after you have cleaned the cooler, verified oil level, and confirmed sensor readings against an independent measurement.
• Motor overload trips continue after voltage, phasing, and demand are all confirmed normal, pointing to a motor or overload relay issue.
• The E-stop circuit will not clear after every physical button and interlock is confirmed reset, suggesting a safety relay or wiring fault.
• You do not have the tools or training to safely depressurize the separator tank or lock out power before opening the unit.
• The compressor is under warranty, since unauthorized service or non-OEM parts can void coverage on Sullivan-Palatek equipment.

Related Articles

• Air Compressor Fault Codes: Complete Guide
• Atlas Copco Air Compressor Fault Codes — Complete Guide
• BOGE Compressor Fault Codes List
• Chicago Pneumatic Compressor Fault Codes — Complete Guide
• CompAir Air Compressor Fault Codes - Complete Guide