Applicable Systems
RTAC 200
Symptoms
The Trane RTAC chiller displays alarm E01, indicating low oil pressure. The compressor lubrication system is not maintaining sufficient oil pressure for safe operation.
Possible Causes
- Oil level in the compressor crankcase too low
- Oil pump worn or damaged, unable to maintain rated pressure
- Oil filter clogged restricting oil flow to bearings
- Oil pressure switch or sensor defective giving false reading
Troubleshooting Steps
- Step 1: Check compressor oil level sight glass
Oil level should be between the minimum and maximum marks on the sight glass - Step 2: Inspect and replace oil filter if clogged
Filter should be replaced per maintenance schedule; check for debris indicating bearing wear - Step 3: Verify oil pressure sensor reading with mechanical gauge
Compare sensor reading to actual mechanical pressure gauge reading - Step 4: Check for oil leaks in the lubrication circuit
All fittings and lines must be tight and leak-free
How to Reset
To reset: 1) Correct the oil level or filter condition. 2) Press the reset button on the chiller control panel. 3) Monitor oil pressure during startup. Caution: Running a compressor with low oil pressure causes immediate bearing damage and potential compressor seizure.
Frequently Asked Questions
- Q: What oil pressure triggers E01 on the RTAC?
E01 triggers when the oil pressure differential falls below the minimum threshold, typically around 15 PSI differential pressure. Consult the specific model manual for exact values.
- Q: Can the chiller restart automatically after E01?
No. E01 is a critical alarm that requires manual reset after the root cause is corrected. The compressor is locked out to prevent damage.
Source: Trane RTAC Chiller Troubleshooting Manual, Alarm Code E01
Category: Chiller