Lennox SCA Fault Code E19
Lennox SCA Fault Code E19 is a warning alarm indicating: Compressor 2 overload. The most common causes include Compressor 2 motor bearing failure. Estimated repair time: 1-2 hours. This alarm requires immediate attention by a certified HVAC technician.
Alarm Description
Compressor 2 overload
Brand: Lennox | Model: SCA (Air-Cooled Scroll Chiller) | Code: E19 | Severity: Warning
Observable Symptoms
- Compressor motor starter or VFD shows overload trip indication
- Motor current reading exceeds nameplate FLA on ammeter
- Compressor may hum but not start, or starts and trips quickly
What to Check First
Before diving into detailed diagnostics, start with this quick first check:
Probable Causes
- Compressor 2 motor bearing failure
- Voltage imbalance on circuit 2
- Liquid floodback to compressor 2
Recommended Inspection Steps
- Measure compressor 2 current
- Check voltage balance
- Verify superheat on circuit 2
- Inspect compressor 2
Required Tools & Equipment
- Clamp-on ammeter
- Digital multimeter
- PT chart for refrigerant type
- Safety PPE (gloves, safety glasses, face shield)
Estimated Repair Time
1-2 hours
When to Call a Professional
- If the fault persists after completing all recommended inspection steps
- If you observe unusual noises, vibrations, or oil leaks from the compressor
- If refrigerant charge levels are outside OEM specifications and EPA-certified recovery is needed
- If electrical measurements show voltage imbalance greater than 2% between phases
- If the fault recurs immediately after reset, indicating an unresolved safety condition
- Contact an authorized Lennox service representative for warranty-covered repairs
Related Fault Codes
Other Lennox SCA codes that may be related:
OEM Service Manual Reference
OEM Reference: Lennox SCA Air-Cooled Scroll Chiller Service Manual. Available through Lennox Commercial technical support.
Frequently Asked Questions
What does Lennox SCA fault code E19 mean?
Fault code E19 on a Lennox SCA chiller indicates: Compressor 2 overload. This is a warning alarm that requires diagnostic attention.
What causes Lennox SCA alarm code E19?
Common causes include: Compressor 2 motor bearing failure; Voltage imbalance on circuit 2; Liquid floodback to compressor 2
How do I fix Lennox SCA error code E19?
Follow the recommended inspection steps below. Start with the quick check, then proceed through each step. If the fault persists after all steps, contact an authorized Lennox service representative.