OEM Service Manual: York YVAA Variable Speed Screw Chiller Service Manual (Form 160.72-S1). Johnson Controls Technical Literature.
30 codes
| Fault Code | Alarm Description | Severity | Probable Causes | Action |
|---|---|---|---|---|
| E1 | Supply fan failure | Warning | Fan motor failure | View Details → |
| E2 | Exhaust fan failure | Warning | Exhaust fan motor seized | View Details → |
| E3 | Compressor A fault | Warning | Compressor motor overload | View Details → |
| E4 | Compressor B fault | Warning | Compressor motor overload | View Details → |
| E5 | Chilled water pump failure | Warning | Pump motor overload tripped | View Details → |
| E6 | Condenser fan failure | Warning | Condenser fan motor failure | View Details → |
| E7 | Expansion valve fault | Warning | Electronic expansion valve stepper motor failure | View Details → |
| E8 | Flow switch fault | Warning | Chilled water flow switch stuck | View Details → |
| E9 | High pressure alarm | Critical | Condenser airflow insufficient | View Details → |
| EA | Low pressure alarm | Warning | Low refrigerant charge | View Details → |
| EB | Freeze protection | Critical | Evaporator water temperature approaching freezing | View Details → |
| EC | Oil temperature high | Warning | Oil cooler inefficiency | View Details → |
| ED | Motor overload | Critical | High motor current from mechanical load | View Details → |
| EE | Phase loss/reversal | Critical | One phase of power missing | View Details → |
| EF | Communication fault | Warning | Network cable fault | View Details → |
| F1 | Compressor surge detection | Warning | System operating too close to surge line | View Details → |
| F2 | VSD communication fault | Warning | VSD communication cable damaged | View Details → |
| F3 | VSD over-temperature | Warning | VSD heatsink temperature too high | View Details → |
| F4 | VSD hardware fault | Warning | VSD power module failure | View Details → |
| F5 | Guide vane position fault | Warning | Guide vane actuator motor failure | View Details → |
| F6 | Oil separator heater fault | Warning | Oil separator heater element failure | View Details → |
| F7 | Economizer fault | Warning | Economizer valve stuck | View Details → |
| F8 | Subcooling control valve fault | Warning | Subcooling valve stepper motor failure | View Details → |
| F9 | Refrigerant leak detection | Warning | Refrigerant leak detector activated | View Details → |
| H7 | High motor bearing temperature | Warning | Bearing lubrication inadequate | View Details → |
| H8 | Low refrigerant charge detected | Warning | Refrigerant leak in system | View Details → |
| H9 | High oil discharge temperature | Warning | Oil cooler inefficiency | View Details → |
| HA | Variable geometry inlet fault | Warning | Variable inlet guide vane actuator failure | View Details → |
| HB | Pumpdown sequence fault | Warning | Pumpdown solenoid valve not closing | View Details → |
| U10 | Low refrigerant level alarm | Warning | Refrigerant leak detected | View Details → |
Disclaimer: All York YVAA fault code 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.