Lennox LCA Fault Code E24

E24
Compressor start inhibit
Warning
SAFETY WARNING: Commercial chillers contain high-pressure refrigerants and high-voltage electrical components (208V-4160V). Only EPA Section 608 certified technicians should perform diagnostic work. Always follow lockout/tagout procedures and wear appropriate PPE. Do not attempt repairs without proper training and equipment.
AI Summary

Lennox LCA Fault Code E24 is a warning alarm indicating: Compressor start inhibit. The most common causes include Safety interlock. Estimated repair time: 1-2 hours. This alarm requires immediate attention by a certified HVAC technician.

Alarm Description

Compressor start inhibit

Brand: Lennox  |  Model: LCA (Air-Cooled Chiller)  |  Code: E24  |  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:

Quick Start: Check interlocks

Probable Causes

  • Safety interlock
  • Anti-recycle timer
  • Oil heater
  • Motor temp

Recommended Inspection Steps

  1. Check interlocks
  2. Wait for timer
  3. Verify heater
  4. Check motor temp

Required Tools & Equipment

  • Oil level sight glass inspection tool
  • 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 LCA codes that may be related:

E01E02E03E04E05

OEM Service Manual Reference

OEM Reference: Lennox LCA Air-Cooled Chiller Service Manual. Available through Lennox Commercial technical support.

Frequently Asked Questions

What does Lennox LCA fault code E24 mean?

Fault code E24 on a Lennox LCA chiller indicates: Compressor start inhibit. This is a warning alarm that requires diagnostic attention.

What causes Lennox LCA alarm code E24?

Common causes include: Safety interlock; Anti-recycle timer; Oil heater

How do I fix Lennox LCA error code E24?

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.

Disclaimer: All lookup data is for reference only. Do not use this information to replace certified professional HVAC technician judgment. Always refer to original OEM official service manual for Lennox LCA service procedures.