OEM Service Manual: York YT Centrifugal Chiller Service Manual. Johnson Controls Technical Literature.
30 codes
| Fault Code | Alarm Description | Severity | Probable Causes | Action |
|---|---|---|---|---|
| E1 | Compressor motor over-temperature | Warning | Motor bearing failure | View Details → |
| E2 | Guide vane position fault | Warning | Actuator motor failure | View Details → |
| E3 | VSD communication fault | Warning | Cable damaged | View Details → |
| E4 | VSD over-temperature | Warning | Heatsink temperature high | View Details → |
| E5 | Surge alarm | Warning | Near surge line | View Details → |
| E6 | Condenser fan fault | Warning | Fan motor failure | View Details → |
| E7 | High condenser pressure | Warning | Condenser coil fouled | View Details → |
| E8 | Low evaporator temperature | Warning | Low refrigerant charge | View Details → |
| E9 | Oil pressure low | Critical | Oil pump failure | View Details → |
| EA | Oil temperature high | Warning | Oil cooler fouled | View Details → |
| EB | Motor current overload | Warning | Bearing failure | View Details → |
| EC | Evaporator water flow fault | Warning | Pump stopped | View Details → |
| ED | Phase fault | Warning | Phase loss | View Details → |
| EE | Communication fault | Warning | Network cable fault | View Details → |
| EF | Freeze protection | Critical | Evaporator water temp near freezing | View Details → |
| F1 | Compressor vibration alarm | Warning | Mounting bolts loose | View Details → |
| E10 | Compressor motor bearing temperature high | Warning | Bearing lubrication inadequate | View Details → |
| E11 | Low refrigerant charge detected | Warning | Refrigerant leak | View Details → |
| E12 | High oil discharge temperature | Warning | Oil cooler inefficiency | View Details → |
| E13 | Variable geometry inlet fault | Warning | Inlet guide vane actuator failure | View Details → |
| E14 | Pumpdown sequence fault | Warning | Pumpdown solenoid not closing | View Details → |
| E15 | Surge detection alarm | Warning | Operating near surge line | View Details → |
| E16 | Oil leak detection | Warning | Oil leak detected | View Details → |
| E17 | VSD speed feedback fault | Warning | Speed sensor failure | View Details → |
| E18 | VSD motor overload | Critical | Motor excessive current | View Details → |
| E19 | VSD DC bus overvoltage | Warning | Regenerative energy | View Details → |
| E20 | VSD DC bus undervoltage | Warning | Input voltage sag | View Details → |
| E21 | VSD output phase loss | Critical | Output terminal loose | View Details → |
| E22 | VSD ground fault | Warning | Ground fault on output | View Details → |
| E23 | VSD communication timeout | Warning | Communication timeout | View Details → |
Disclaimer: All York YT 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.