York YCAL Fault Code E4

E4
PG motor feedback abnormal
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 YCAL Fault Code E4 is a warning alarm indicating: PG motor feedback abnormal. The most common causes include PG motor Hall sensor failure. Estimated repair time: 1-2 hours. This alarm requires immediate attention by a certified HVAC technician.

Alarm Description

PG motor feedback abnormal

Brand: York  |  Model: YCAL (Air-Cooled Scroll Chiller)  |  Code: E4  |  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 PG motor operation visually

Probable Causes

  • PG motor Hall sensor failure
  • Motor feedback wire loose
  • Motor control board fault

Recommended Inspection Steps

  1. Check PG motor operation visually
  2. Measure Hall sensor output signal
  3. Verify motor feedback wiring
  4. Replace PG motor if signal is absent

Required Tools & Equipment

  • Safety PPE (gloves, safety glasses, face shield)
  • Wire tracing and continuity tester

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 YCAL codes that may be related:

E1E2E3E5E8

OEM Service Manual Reference

OEM Reference: York YCAL Air-Cooled Scroll Chiller Installation and Maintenance Manual (Form 160.00-S1). Johnson Controls/York Technical Literature.

Frequently Asked Questions

What does York YCAL fault code E4 mean?

Fault code E4 on a York YCAL chiller indicates: PG motor feedback abnormal. This is a warning alarm that requires diagnostic attention.

What causes York YCAL alarm code E4?

Common causes include: PG motor Hall sensor failure; Motor feedback wire loose; Motor control board fault

How do I fix York YCAL error code E4?

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 YCAL service procedures.