Lennox LSB Fault Code E01
Lennox LSB Fault Code E01 is a critical safety alarm indicating: High pressure alarm. The most common causes include Condenser water flow low. Estimated repair time: 4-6 hours (requires isolating water circuit, mechanical or chemical tube cleaning). This alarm requires immediate attention by a certified HVAC technician.
Alarm Description
High pressure alarm
Brand: Lennox | Model: LSB (Water-Cooled Chiller) | Code: E01 | Severity: Critical
Observable Symptoms
- Compressor shuts down on high pressure safety cutout
- Discharge pressure gauge reads above normal operating range
- Condenser may feel hot to touch or airflow feels restricted
What to Check First
Before diving into detailed diagnostics, start with this quick first check:
Probable Causes
- Condenser water flow low
- Condenser water temp high
- Non-condensables
- Condenser tubes fouled
Recommended Inspection Steps
- Verify condenser water flow
- Check entering water temp
- Vent non-condensables
- Clean tubes
Required Tools & Equipment
- Coil cleaning brush and coil cleaner
- Safety PPE (gloves, safety glasses, face shield)
Estimated Repair Time
4-6 hours (requires isolating water circuit, mechanical or chemical tube cleaning)
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 LSB codes that may be related:
OEM Service Manual Reference
OEM Reference: Lennox LSB Chiller Service Manual. Available through Lennox Commercial technical support.
Frequently Asked Questions
What does Lennox LSB fault code E01 mean?
Fault code E01 on a Lennox LSB chiller indicates: High pressure alarm. This is a critical safety alarm that requires diagnostic attention.
What causes Lennox LSB alarm code E01?
Common causes include: Condenser water flow low; Condenser water temp high; Non-condensables
How do I fix Lennox LSB error code E01?
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.