Kaeser K001: Kaeser ASD/BS Series Error Code K001

Symptoms

Compression temperature at the airend discharge exceeds 110C (230F). The Sigma Control 2 triggers an immediate shutdown to prevent oil breakdown and rotor coating damage.

Possible Causes

Oil cooler fins heavily contaminated with dust, lint, or oil film blocking airflow
Cooling fan motor failed or fan blade broken, reducing air volume through the cooler
Thermostatic valve malfunction keeping oil in bypass and away from the cooler
Ambient temperature above 45C (113F) exceeding the design rating of the standard cooler

Troubleshooting Steps

Step 1: Inspect the oil cooler from the fan side - shine a flashlight through the fins to check for blockage
Blow out fins with compressed air (max 2 bar) or wash with foaming cleaner if oily
Step 2: Start the compressor and verify the cooling fan starts within 5 seconds of the airend running
If the fan does not turn, test the fan motor capacitor and winding resistance; replace motor if failed
Step 3: Remove the thermostatic valve and immerse in a temperature-controlled oil bath
The valve should begin opening at 75C and be fully open by 85C. Replace if response is sluggish or incorrect
Step 4: Measure the compressor room ambient temperature at the intake grille height
Install exhaust ventilation or duct hot air outside if ambient exceeds 40C for more than 2 hours daily

How to Reset

Reset: Allow airend temperature to drop below 95C. Press the Alarm Acknowledge button on Sigma Control 2. The unit performs a 15-second star-delta start sequence before loading.

Common Replacement Parts

6.1985.0: Oil cooler, ASD 40-50 (Aluminum plate-fin, 480x320x60 mm)
6.1986.0: Cooling fan motor, 400V 3-phase (0.75 kW, 1400 RPM, IP55)
6.1987.0: Thermostatic valve, 1-inch BSP (75C opening, 85C full flow)

Frequently Asked Questions

Q: What is the maximum allowable compression temperature?
110C is the hard limit. Sustained operation above 100C degrades synthetic oil and can carbon-coat the rotors, reducing efficiency by 10-20%.
Q: Can I install a larger cooler on an ASD?
Yes. Kaeser offers high-temperature coolers (HT suffix) for ambient conditions up to 50C. Order by model number with -HT designation.

Kaeser ASD/BS Series Error Code K001