York YCAL Fault Code H2
York YCAL Fault Code H2 is a warning alarm indicating: Low evaporating temperature. The most common causes include Low refrigerant charge. Estimated repair time: 2-4 hours (requires leak repair, evacuation, and refrigerant recharge). This alarm requires immediate attention by a certified HVAC technician.
Alarm Description
Low evaporating temperature
Brand: York | Model: YCAL (Air-Cooled Scroll Chiller) | Code: H2 | 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
- Low refrigerant charge
- Expansion valve issue
- Low water flow
- Fouled evaporator
Recommended Inspection Steps
- Check refrigerant charge
- Inspect expansion valve
- Measure water flow
- Clean evaporator if fouled
Required Tools & Equipment
- Coil cleaning brush and coil cleaner
- Infrared thermometer or calibrated temperature probe
- PT chart for refrigerant type
- Safety PPE (gloves, safety glasses, face shield)
Estimated Repair Time
2-4 hours (requires leak repair, evacuation, and refrigerant recharge)
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:
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 H2 mean?
Fault code H2 on a York YCAL chiller indicates: Low evaporating temperature. This is a warning alarm that requires diagnostic attention.
What causes York YCAL alarm code H2?
Common causes include: Low refrigerant charge; Expansion valve issue; Low water flow
How do I fix York YCAL error code H2?
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.