| Document type | Installation Guide |
|---|---|
| Document number | 450.50-N1 |
| Equipment | YK Centrifugal Chiller |
| Brand | YORK |
| File size | 5.9 MB |
Fault codes in this document
Section 2 - Installation
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| Print functions enabled (03478 microboard note) | Enabling any part of Print functions disrupts BAS/SC-EQ communications. | Any part of the Print functions enabled. | Refer to YORK Equipment form 201.21-NMx in the Installation, Operation and Maintenance (IOM) air-cooled screw liquid chillers manual for more information. | 33 |
| MS/TP Bus conflict | Conflict on the MS/TP Bus resulting in no communication between the chiller IPU I board and the E-Link Gateway. | The Chiller address and the SC-EQ address are set to the same value. | Do not set the Chiller address and the SC-EQ address to the same value. | 34 |
Section 3 - Troubleshooting
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| Power LED OFF | If the power source is present at the SC-EQ power terminals (J9 +12 VDC [Red wire + Black wire -] or J10 24 V AC as applicable) and the Power LED is not illuminated, then the SC-EQ is faulty. | Power source present at the SC-EQ power terminals but Power LED not illuminated. | Use a digital multimeter to verify the power source to the SC-EQ is present. | 37 |
| BRX LED illuminates solid | BAS Port receive LED stays on continuously instead of blinking with data packets sent on the BAS network. | The + and - RS-485 wires are probably swapped. | The + and - RS-485 wires must be corrected. | 37 |
| ETX illuminated, microboard Receive LED illuminated, no response transmitted from the microboard | No response transmitted from the microboard to the SC-EQ request for data. | Chiller address not set to 1. | Check that the chiller address is set to 1. For microboards with a rotary switch, set the switch to 0 (interpreted as 1). If the address is set in the software, then it should be set to 1. | 38 |
| BS BUS LED off continuously | The SC-EQ board is not likely seeing any valid communications occurring on the BAS bus. | Make simple voltage measurements with a DC voltmeter on the SC-EQ board and the BAS communication bus to help diagnose the problem. | 38 | |
| Fault LED blinks at a 500 ms cycle Unable to Load Firmware | The SC-EQ could not load a firmware update. | Try loading the firmware update on to another USB thumb drive and perform the update again. | 39 | |
| Fault LED blinks at a 1 second cycle Firmware Validation Failure | The SC-EQ fails to validate the firmware at intial power up or after a firmware upgrade. | Try cycling power to the SC-EQ and updating the firmware again. | 39 | |
| Fault LED ON solid Firmware Programming Required | No firmware is present. | Complete a firmware update to remedy this. | 39 |
Section 4 - SC-AP gateway
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| Offline | Status displayed on the SC-EQ Data tab (viewed via the SC-AP) for the BAS or EQ port. | Either the BAS or the EQ port are not active for a short period of time. | The SC-EQ continually tries to connect to the absent ports (automatic retry). | 43 |
| No Protocol | Status displayed on the SC-EQ Data tab (viewed via the SC-AP) for the BAS or EQ port. | Communications is not present for a few minutes. | The SC-EQ continually tries to connect to the absent ports (automatic retry). | 43 |
| Invalid points offline | If an E-Link is replaced by an SC-EQ, the BAS shows the points that were previously nonrelevant as offline. | The E-Link transfers a list of all possible chiller parameters to the BAS, even ones that do not apply; the SC-EQ discovers the chiller type and features and exposes only the relevant points to the BAS. | Either delete the E-Link and re-discover the SC-EQ or delete each of the inappropriate offline points. | 45 |
| Unreliable remote setpoints | Points that are commandable show as unreliable. | The BAS has not sent the setpoints. | Condition lasts until the BAS sends the setpoints. | 45 |
| Auto Detected Chiller Model: NONE (No chiller model type detected) | Auto Detected Chiller Protocol is displayed as YorkTalk2 but the Auto Detected Chiller Model is NONE. Some Modbus chillers do not identify their model type over the Modbus protocol. | Some of the older YorkTalk2 chillers do not have programming in place to communicate their chiller model to the SC-EQ. | Use the MANUALLY SELECTED CHILLER MODEL selection to load the appropriate chiller model into the SC-EQ. A few seconds after the selection is applied, the SC-EQ begins to reprogram the Currently Loaded Equipment Model; this may take up to 8 minutes to complete. Upon completion, the SC-EQ reboots and then begins to run using the selected chiller model. | 46 |
| SC-EQ fails to retrieve point data | The SC-EQ continues to use the old or invalid Modbus address. The SC-EQ never times out and then attempts to rediscover the new Modbus address of the previously connected chiller. | The Modbus address of the chiller was modified. | After changing the address of the BAS or SC-EQ connected devices, it is recommended to reboot the SC-EQ. | 46 |
Section 6 - LON ProtoNode
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| SPL | The SPL LED lights up if the unit is not getting a response from one or more of the configured devices. For LonWorks units, LED lights up until the unit is commissioned on the LonWorks network. | No response from one or more of the configured devices; for LonWorks units, the unit is not yet commissioned on the LonWorks network. | Commission the unit on the LonWorks network (LonWorks units). | 56 |
| ERR (SYS ERR LED) | A steady red light indicates a system error on the unit. (The LED normally lights up 15 seconds after powering up and turns off after 5 seconds.) | If a steady red light occurs, immediately report the related system error shown in the error screen of the GUI to support for evaluation. | 56 |
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 YK 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.