York Heat Pump: YHM
Re: Fault Codes
The fault and status codes for the YHM heat pump are displayed on the small control board mounted beneath the large inverter board.
LED | Seg 1 | Seg 2 | Description |
Solid | 0 | 0 | Control Failure |
Operational Faults | |||
Solid | 0 | 1 | Hi Pressure Fault (not in lockout) |
2 | 0 | 2 | Hi Pressure Soft Lockout (last mode HP) |
3 | 0 | 2 | Hi Pressure Hard Lockout (last mode HP) |
2 | 0 | 3 | Hi Pressure Soft Lockout (last mode defrost) |
3 | 0 | 3 | Hi Pressure Hard Lockout (last mode defrost) |
2 | 0 | 4 | Low Pressure Soft Lockout |
3 | 0 | 4 | Low Pressure Hard Lockout |
Solid | 0 | 6 | Low Voltage (less than 19.2V) |
Solid | 0 | 7 | Low Voltage (less than 16V) |
Solid | 0 | 8 | Inverter Communication Fault |
Sensor/Switch Faults | |||
Solid | 0 | 9 | OD Sensor Failure (Short) |
Solid | 1 | 0 | OD Sensor Failure (Open) |
Solid | 1 | 1 | Liquid Line Sensor Failure (Short) |
Solid | 1 | 2 | Liquid Line Sensor Failure (Open) |
Solid | 1 | 3 | Discharge Sensor Failure (Short) |
Solid | 1 | 4 | Discharge Sensor Failure (Open) |
Solid | 1 | 5 | Hi Discharge Temperature |
Solid | 1 | 6 | Low Discharge Temperature |
Wiring-Related Faults | |||
Solid | 1 | 8 | "O" Received in AC-Only Mode |
Solid | 1 | 9 | "W" Received in Cooling Mode |
Solid | 2 | 0 | "W" and "O" Received in AC-Only Mode |
Solid | 2 | 4 | "W" and "O" Received in Cooling Mode |
Mismatch Speed Faults | |||
Solid | 2 | 5 | Compressor Start Failure |
Solid | 2 | 6 | OD Fan Start Failure |
Operating Threshold Errors | |||
Solid | 2 | 7 | OD Temperature 109 - 125 deg. (Cool Mode) |
Solid | 2 | 8 | OD Temperature > 125 deg. (Cool Mode) |
Solid | 2 | 9 | OD Temperature < 35 deg. (Cool Mode) |
Inverter - Major Faults | |||
Solid | 3 | 1 | Compressor Inverter Fault |
Solid | 3 | 2 | Fan Inverter Fault |
Solid | 3 | 3 | Loss of Communication with Inverter |
Solid | 3 | 4 | DC Over-Voltage |
Solid | 3 | 5 | DC Under-Voltage |
Solid | 3 | 6 | Compressor Inverter Over-Current |
Solid | 3 | 7 | IPM Over-Temperature |
Solid | 3 | 8 | DC Over-Voltage - IPM |
Solid | 3 | 9 | DC Under-Voltage - IPM |
Solid | 4 | 0 | Compressor Speed Mis-Alignment |
Solid | 4 | 1 | Phase Lost Detected by Speed |
Solid | 4 | 2 | Phase Lost Detected by Current |
Solid | 4 | 3 | Compressor IPM Fault - by IGBT Voltage |
Solid | 4 | 4 | inverter PWM Logic Error |
Solid | 4 | 5 | Inverter PWM Initialization Error |
Solid | 4 | 6 | Compressor Inverter Shunt Resistor Unbalanced |
Solid | 4 | 7 | Fan Inverter IPM Fault |
Solid | 4 | 8 | Fan Inverter Misalignment 7 Locked Rotor |
Solid | 4 | 9 | Fan Inverter Phase Lost |
Solid | 5 | 0 | Fan Inverter DC bus under/over voltage |
Solid | 5 | 1 | Fan Inverter Over Current |
Solid | 5 | 2 | Compressor IPM Fault - by Low IGBT Voltage |
Solid | 5 | 3 | Analog Digital Converter Offset Error |
2 | 5 | 4 | Inverter Drive Soft Lockout (3 faults in 30 min) |
3 | 4 | 4 | Inverter Drive Hard Lockout (4 soft lockouts in 2 hrs) |
Solid | 5 | 6 | Crankcase Heater Fault |
Inverter Minor Faults | |||
Solid | 6 | 0 | IPM Over-Temperature (Speed Limiting) |
Solid | 6 | 1 | DC Low Voltage (Speed Limiting) |
Solid | 6 | 2 | Compressor Over-Current (Speed Limiting) |
Solid | 6 | 3 | DC Voltage Low (Speed Reducing) |
Solid | 6 | 4 | Compressor Over-Current (Speed Reducing) |
Solid | 6 | 5 | IPM Over-Temperature (Speed Reducing) |