York YK Fault Code E11

E11
Low refrigerant charge detected
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

York YK Fault Code E11 is a warning alarm indicating: Low refrigerant charge detected. The most common causes include Refrigerant leak in system. Estimated repair time: 1-2 hours. This alarm requires immediate attention by a certified HVAC technician.

Alarm Description

Low refrigerant charge detected

Brand: York  |  Model: YK (Centrifugal Chiller (Water-Cooled))  |  Code: E11  |  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 subcooling and superheat

Probable Causes

  • Refrigerant leak in system
  • Subcooling below expected
  • Level sensor indicating low charge

Recommended Inspection Steps

  1. Check subcooling and superheat
  2. Perform leak test
  3. Repair and recharge
  4. Verify by weigh-in

Required Tools & Equipment

  • EPA-certified refrigerant recovery unit
  • Electronic leak detector
  • PT chart for refrigerant type
  • 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 York service representative for warranty-covered repairs

Related Fault Codes

Other York YK codes that may be related:

E1E2E3E4E5

OEM Service Manual Reference

OEM Reference: York YK Centrifugal Chiller Service Manual (Form 160.60-S1). Johnson Controls Technical Literature.

Frequently Asked Questions

What does York YK fault code E11 mean?

Fault code E11 on a York YK chiller indicates: Low refrigerant charge detected. This is a warning alarm that requires diagnostic attention.

What causes York YK alarm code E11?

Common causes include: Refrigerant leak in system; Subcooling below expected; Level sensor indicating low charge

How do I fix York YK error code E11?

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 York 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 York YK service procedures.