Air Compressor Fault — High Discharge Temperature

What This Fault Means

A high discharge temperature fault means the compressed air leaving the compressor element exceeded the safe operating limit (typically 100–110°C / 212–230°F). The compressor shuts down to prevent oil degradation and element damage.

Common Causes

• Dirty or clogged oil cooler (air or oil side)
• Low oil level in the sump
• Failed thermal bypass valve (oil bypasses the cooler permanently)
• Ambient temperature too high for the cooler capacity
• Clogged air intake filter restricting cooling airflow

Recommended Fix

1. Clean the oil cooler — blow compressed air through the fins opposite to normal airflow direction.
2. Check the oil level through the sight glass and top off if low.
3. Verify the thermal bypass valve opens when the oil is cool and routes through the cooler when hot.
4. Replace the air intake filter if restricted.
5. Ensure minimum 1m clearance around the compressor for ventilation.