| Document type | Service Information Letter |
|---|---|
| Document number | SI0640 |
| Equipment | YVAA Style B Air-Cooled Screw Chiller |
| Brand | YORK |
| Revised | 2026-06-18 |
| File size | 0.3 MB |
Fault codes in this document
ZIEHL-ABEGG Variable Speed Fan — Motor Fault Codes (LED Status/Fault Light)
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| LED OFF | No voltage supply. Unit is switched off and will automatically turn on when the voltage has been restored. | Check voltage supply. | 3 | |
| 1 No enable = OFF | No enable = OFF | Terminal “D1” – “24V” (Digital In 1) not bridged | Check jumpers/wiring connections. | 3 |
| 2 Temperature management active | The device has integrated active temperature management to protect the device from damage caused by excessively high internal temperatures. | Internal temperature increases above the predetermined limits. | The speed is linearly reduced. When the temperature drops, the speed rises again linearly. Check installation of the device and cooling of the motor. | 3 |
| 3 Error rotor position | Determination of the rotor position has failed. | After 8 starting tests, the error message is displayed. Check whether the motor can rotate freely (without line voltage). | 3 | |
| 4 Line failure (only for 3 ~ types) | The device is provided with a built-in phase-monitoring function for the mains supply. | Mains interruption (failure of a fuse or mains phase). | The unit switches off after a delay (approx. 200 ms). Following a shutoff, a startup attempt is made after approximately 15 seconds, if the voltage supply is present. This will continue to occur until all 3 supply phases are present. Check power supply. | 3 |
| 5 Motor blocked | If after 8 seconds of attempting to rotate no speed is measured, the fault “Motor blocked” is released. | Device switches off, attempt to restart after about 2.5 sec. After the fourth starting test fails, the device locks out. After lockout, it is necessary to reset by disconnecting the line voltage. Check whether the motor can rotate freely (without line voltage). | 3 | |
| 6 Failure power module | Failure power module | Short circuit to earth or short circuit of the motor winding. | EC-Controller switches off, attempt to restart after about 60 sec. If (following a second starting test) a second fault detection is detected within a period of 60 seconds, the device locks out. After lockout, it is necessary to reset by disconnecting the line voltage. | 3 |
| 7 Intermediate undervoltage | If the DC-link voltage drops below a specified limit, the device will switch off. | If the DC-link voltage rises above the limit within 75 seconds, then the controller will attempt to start. Should the DC-link voltage stay, for more than 75 seconds, below the limit, the device will switch off with a fault message. | 3 | |
| 8 Intermediate circuit overvoltage | If the DC-link voltage increases above a specified limit, the motor will switch off. | If the DC-link voltage drops below the limit within 75 seconds, then the controller will attempt to start. Should the DC-link voltage stay above the limit for more than 75 seconds, the device will switch off with a fault message. | 3 | |
| 9 Cooling down period power module | Cooling down period power module for approx. 60 sec. | Final shutoff after 2 cooling-off intervals. | 3 | |
| 10 Communication fault | If the communication watchdog is active, it signals that MODBUS communication is interrupted. | Response dependent on set watchdog mode. Check MODBUS communication. | 4 | |
| 11 Error motor start | If a starting command is given (enable available and Setpoint > 0) and the motor does not start to turn in the correct direction within 5 minutes, then an error message will appear. | If it is possible to start the motor in the correct direction of rotation after the error message, the error message will disappear. Should a voltage interruption occur during the 5 minute duration of the fault, the timer will reset. Check whether the motor can rotate freely (without line voltage). Check if the fan is spinning in reverse direction by air stream. | 4 | |
| 12 Line voltage too low | If the DC-link voltage drops below a specified limit the device will switch off. | If the line voltage rises above a specified limit within 75 seconds, then the controller will attempt to start. Should the line voltage stay below the specified limit for more than 75 seconds, the device will switch off with an error message. | 4 | |
| 13 Line voltage too high | If the line voltage increases above a specified limit, the motor will switch off. | Cause of high input voltage | If the line voltage drops below the specified limit within 75 seconds, then the controller will attempt to start. Should the line voltage stay above the specified limit for more than 75 seconds, the device will switch off with an error message. | 4 |
| 14 Error peak current | If the motor current increases above the specified limit (even in a short timeframe) the device will switch-off. | After a switch off, the controller waits for 5 seconds then the controller attempts to restart. If there are 5 faults within 60 seconds of the first fault, the device locks out. If there are no additional faults, after 60 seconds the counter will be reset. | 4 | |
| 17 Temperature alarm | Excess of the max. permissible internal temperature. | Controller switches off motor. Automatic restarting after cooling down. Check installation of the device and cooling of the controller. | 4 | |
| 18 System error | Device has detected a system error. Only limited operation or no operation is possible. | The error is displayed immediately. The motor is switched off depending on the system error. Reset fault by disconnecting the voltage supply. If the error message persists, replace assembly. | 4 | |
| 20 a) Vibration values | If the vibration velocity rises above the specified limits, an error message is issued. | The error is displayed after the set time. The device will continue to operate. Check the impeller for damage, contamination, or ice formation. | 4 | |
| 20 b) Lifetime | If the remaining service life falls below the defined limit, an error message is issued. | The error is displayed immediately. The device will continue to operate. If the error message persists, replace assembly. | 4 | |
| Continuous short flash Internal communication error | Internal communication failure. Fault indication. | If the error message persists, replace assembly. | 5 | |
| 1 Long, 2 Short MODBUS Recovery function | A failure in the MODBUS communication has been detected, e.g. incorrect communication parameters (baud rate, parity), wiring error. | Incorrect communication parameters (baud rate, parity), wiring error. | The motor can be accessed in recovery mode using the following parameters: Address 254, 19200Baud / 8E1. Check the bus wiring and communication parameters. | 5 |
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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.