York YVAA Fault Code EE

EE
Phase loss/reversal
Critical
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 YVAA Fault Code EE is a critical safety alarm indicating: Phase loss/reversal. The most common causes include One phase of power missing. Estimated repair time: 30-60 minutes (requires electrical power diagnostics at disconnect). This alarm requires immediate attention by a certified HVAC technician.

Alarm Description

Phase loss/reversal

Brand: York  |  Model: YVAA (Variable Speed Screw Chiller)  |  Code: EE  |  Severity: Critical

Observable Symptoms

  • Phase monitor relay indicates phase loss or reversal
  • Compressor may run backwards or fail to start
  • Three-phase voltage readings are unbalanced

What to Check First

Before diving into detailed diagnostics, start with this quick first check:

Quick Start: Check all three phases for voltage

Probable Causes

  • One phase of power missing
  • Phase sequence incorrect
  • Blown fuse on one phase

Recommended Inspection Steps

  1. Check all three phases for voltage
  2. Verify phase sequence with tester
  3. Check and replace any blown fuses
  4. Correct phase sequence if reversed

Required Tools & Equipment

  • Digital multimeter
  • Phase rotation tester
  • Safety PPE (gloves, safety glasses, face shield)

Estimated Repair Time

30-60 minutes (requires electrical power diagnostics at disconnect)

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 YVAA codes that may be related:

E1E2E3E4E5

OEM Service Manual Reference

OEM Reference: York YVAA Variable Speed Screw Chiller Service Manual (Form 160.72-S1). Johnson Controls Technical Literature.

Frequently Asked Questions

What does York YVAA fault code EE mean?

Fault code EE on a York YVAA chiller indicates: Phase loss/reversal. This is a critical safety alarm that requires diagnostic attention.

What causes York YVAA alarm code EE?

Common causes include: One phase of power missing; Phase sequence incorrect; Blown fuse on one phase

How do I fix York YVAA error code EE?

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 YVAA service procedures.