Lennox SCA Fault Code E22
Lennox SCA Fault Code E22 is a warning alarm indicating: Oil pressure fault 2. The most common causes include Oil pump 2 failure. Estimated repair time: 1-2 hours (requires oil addition or oil change, filter replacement). This alarm requires immediate attention by a certified HVAC technician.
Alarm Description
Oil pressure fault 2
Brand: Lennox | Model: SCA (Air-Cooled Scroll Chiller) | Code: E22 | Severity: Warning
Observable Symptoms
- Oil sight glass shows low level or empty
- Compressor may make unusual noise from lack of lubrication
- Oil pressure differential alarm may also be active
What to Check First
Before diving into detailed diagnostics, start with this quick first check:
Probable Causes
- Oil pump 2 failure
- Oil filter 2 clogged
- Low oil in compressor 2
Recommended Inspection Steps
- Check compressor 2 oil level
- Replace oil filter 2
- Measure oil pump 2 pressure
Required Tools & Equipment
- Oil level sight glass inspection tool
- Safety PPE (gloves, safety glasses, face shield)
Estimated Repair Time
1-2 hours (requires oil addition or oil change, filter replacement)
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 E22 mean?
Fault code E22 on a Lennox SCA chiller indicates: Oil pressure fault 2. This is a warning alarm that requires diagnostic attention.
What causes Lennox SCA alarm code E22?
Common causes include: Oil pump 2 failure; Oil filter 2 clogged; Low oil in compressor 2
How do I fix Lennox SCA error code E22?
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.