Lennox LSB Fault Code E06
Lennox LSB Fault Code E06 is a warning alarm indicating: Condenser water flow fault. The most common causes include Condenser pump stopped. 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
Condenser water flow fault
Brand: Lennox | Model: LSB (Water-Cooled Chiller) | Code: E06 | Severity: Warning
Observable Symptoms
- Water flow indicator shows zero or low flow
- Differential pressure across evaporator or condenser is low
- Pump may not be running or making abnormal noise
What to Check First
Before diving into detailed diagnostics, start with this quick first check:
Probable Causes
- Condenser pump stopped
- Flow switch fault
- Tubes fouled
Recommended Inspection Steps
- Verify pump
- Check flow switch
- 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 E06 mean?
Fault code E06 on a Lennox LSB chiller indicates: Condenser water flow fault. This is a warning alarm that requires diagnostic attention.
What causes Lennox LSB alarm code E06?
Common causes include: Condenser pump stopped; Flow switch fault; Tubes fouled
How do I fix Lennox LSB error code E06?
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.