Lennox TCS Fault Code E26
Lennox TCS Fault Code E26 is a warning alarm indicating: Compressor vibration alarm 2. The most common causes include Compressor 2 mounting bolts loose. Estimated repair time: 1-2 hours. This alarm requires immediate attention by a certified HVAC technician.
Alarm Description
Compressor vibration alarm 2
Brand: Lennox | Model: TCS (Water-Cooled Screw Chiller) | Code: E26 | Severity: Warning
Observable Symptoms
- Controller displays alarm code and description
- Chiller may be locked out or running in degraded mode
- Alarm indicator light is illuminated on control panel
What to Check First
Before diving into detailed diagnostics, start with this quick first check:
Probable Causes
- Compressor 2 mounting bolts loose
- Bearing wear in compressor 2
- Foundation issue for compressor 2
Recommended Inspection Steps
- Measure compressor 2 vibration
- Tighten mounting bolts
- Inspect bearings
- Verify foundation
Required Tools & Equipment
- Digital multimeter
- OEM service manual
- Safety PPE (gloves, safety glasses)
- 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 TCS codes that may be related:
OEM Service Manual Reference
OEM Reference: Lennox TCS Water-Cooled Screw Chiller Service Manual. Available through Lennox Commercial technical support.
Frequently Asked Questions
What does Lennox TCS fault code E26 mean?
Fault code E26 on a Lennox TCS chiller indicates: Compressor vibration alarm 2. This is a warning alarm that requires diagnostic attention.
What causes Lennox TCS alarm code E26?
Common causes include: Compressor 2 mounting bolts loose; Bearing wear in compressor 2; Foundation issue for compressor 2
How do I fix Lennox TCS error code E26?
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.