| Document type | Service Information Letter |
|---|---|
| Document number | SI0487 |
| Equipment | YLAA Scroll Chiller |
| Brand | YORK |
| File size | 1.6 MB |
Fault codes in this document
Fault Code (Red LED color)
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| Phase failure (Red LED, 1 pulse) | Automatic restart once phase failure is corrected | 4 | ||
| Power module overheated (Red LED, 3 pulses) | Power cycle required | 4 | ||
| Internal communications error between primary/secondary controller (Red LED, 4 pulses) | Primary = electronics, Secondary = motor | Power cycle required | 4 | |
| Motor overheated (Red LED, 6 pulses) | Power cycle required | 4 | ||
| Hall sensor error (Red LED, 7 pulses) | Power cycle required | 4 | ||
| Motor blocked (Red LED, 8 pulses) | Automatic restart after blockage is cleared | 4 | ||
| Speed limit exceeded (Red LED, 9 pulses) | Automatic restart | 4 | ||
| Rotor position sensor calibration error (Red LED, 11 pulses) | Power cycle required | 4 | ||
| DC-link undervoltage (Red LED, 13 pulses) | Automatic restart after undervoltage is cleared | 4 |
Fault Code (Yellow LED color)
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| Current limitation in action (Yellow LED, 1 pulse) | Current limited to prevent damage of the electronics | 4 | ||
| Line impedance too high (Yellow LED, 2 pulses) | DC link voltage is instable | 4 | ||
| Power limiter in action (Yellow LED, 3 pulses) | Derating is active | 4 | ||
| Output stage temperature high (Yellow LED, 4 pulses) | Temperature > 105°C | 4 | ||
| Motor temperature high (Yellow LED, 5 pulses) | Temperature > 130°C | 4 | ||
| Temperature inside electronics high (Yellow LED, 6 pulses) | Temperature > 105°C | 4 | ||
| DC-link voltage low (Yellow LED, 7 pulses) | DC-link < 460 V | 4 | ||
| Calibration of rotor position (Yellow LED, 9 pulses) | Calibration of rotor position sensor in progress | 4 | ||
| Cable break at analog or PWM input for analog set value (Yellow LED, 11 pulses) | Check wiring. NOTE: This fault code may be present if the command signal to the motor is 0%. Increase command signal to check if wiring issue. | 4 | ||
| DC-link voltage high (Yellow LED, 13 pulses) | DC-link > 850 V | 4 | ||
| Line-voltage high (Yellow LED, 15 pulses) | U1_peak > 850 VDC | 4 | ||
| Shedding function active (Yellow LED, 16 pulses) | Shedding function is active and fan is blocked | 4 |
Every row above cites the page of this document it came from, and each one is re-read against that page by an automatic check before publication. The short table of all YORK YLAA messages: fault codes.
Manufacturer document, published here as reference material for equipment we supply. The original lives at docs.johnsoncontrols.com. The rights holder may ask us to take it down — we will.