Lennox SCA Fault Code E07
Lennox SCA Fault Code E07 is a warning alarm indicating: Compressor overload. The most common causes include Compressor motor bearing wear. Estimated repair time: 1-2 hours. This alarm requires immediate attention by a certified HVAC technician.
Alarm Description
Compressor overload
Brand: Lennox | Model: SCA (Air-Cooled Scroll Chiller) | Code: E07 | 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 motor bearing wear
- Supply voltage low or imbalanced
- Liquid refrigerant floodback
- Mechanical overload from system conditions
Recommended Inspection Steps
- Measure compressor motor current on all phases
- Check supply voltage and phase balance
- Verify adequate superheat to prevent floodback
- Inspect motor winding resistance and insulation
- Check compressor for mechanical issues
Required Tools & Equipment
- Clamp-on ammeter
- Digital multimeter
- PT chart for refrigerant type
- Phase rotation tester
- 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 E07 mean?
Fault code E07 on a Lennox SCA chiller indicates: Compressor overload. This is a warning alarm that requires diagnostic attention.
What causes Lennox SCA alarm code E07?
Common causes include: Compressor motor bearing wear; Supply voltage low or imbalanced; Liquid refrigerant floodback
How do I fix Lennox SCA error code E07?
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.