York YK Fault Code EC
York YK Fault Code EC is a warning alarm indicating: Motor current overload. The most common causes include Bearing failure. Estimated repair time: 1-2 hours. This alarm requires immediate attention by a certified HVAC technician.
Alarm Description
Motor current overload
Brand: York | Model: YK (Centrifugal Chiller (Water-Cooled)) | Code: EC | Severity: Warning
Observable Symptoms
- Compressor motor starter or VFD shows overload trip indication
- Motor current reading exceeds nameplate FLA on ammeter
- Compressor may hum but not start, or starts and trips quickly
What to Check First
Before diving into detailed diagnostics, start with this quick first check:
Probable Causes
- Bearing failure
- Voltage imbalance
- Floodback
- Mechanical overload
Recommended Inspection Steps
- Measure current
- Check voltage
- Verify superheat
- Inspect compressor
Required Tools & Equipment
- Clamp-on ammeter
- Digital multimeter
- 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:
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 EC mean?
Fault code EC on a York YK chiller indicates: Motor current overload. This is a warning alarm that requires diagnostic attention.
What causes York YK alarm code EC?
Common causes include: Bearing failure; Voltage imbalance; Floodback
How do I fix York YK error code EC?
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.