York YVAA Fault Code E4
York YVAA Fault Code E4 is a warning alarm indicating: Compressor B fault. The most common causes include Compressor motor overload. Estimated repair time: 1-2 hours. This alarm requires immediate attention by a certified HVAC technician.
Alarm Description
Compressor B fault
Brand: York | Model: YVAA (Variable Speed Screw 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:
Probable Causes
- Compressor motor overload
- Mechanical fault in compressor B
- VSD compressor B fault
Recommended Inspection Steps
- Measure compressor B motor current
- Check VSD for compressor B fault codes
- Verify oil level and pressure
- Inspect compressor mechanically
Required Tools & Equipment
- Clamp-on ammeter
- Digital multimeter
- 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 York service representative for warranty-covered repairs
Related Fault Codes
Other York YVAA codes that may be related:
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 E4 mean?
Fault code E4 on a York YVAA chiller indicates: Compressor B fault. This is a warning alarm that requires diagnostic attention.
What causes York YVAA alarm code E4?
Common causes include: Compressor motor overload; Mechanical fault in compressor B; VSD compressor B fault
How do I fix York YVAA 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.