York OptiView chiller panels report faults as named, color-coded messages, not numeric fault codes. Orange marks a cycling shutdown, red marks a safety shutdown, yellow is a warning and green is normal operation. This guide lists shutdown messages York names in its YK Style G engineering guide and points to the service document for causes.
What OptiView messages are
If you searched for York chiller fault codes, you probably expected a table of numbers. The York engineering guide we reviewed does not use one. It describes an OptiView control center that displays plain-language messages and color-codes them by severity. The message text is the identifier. We found no numeric OptiView code scheme in York's documents, and this article does not use the “York chiller fault codes” PDFs that circulate on unrelated websites.
That changes how you work a call. You do not look up a code and read a cause across. You read the message, note its color, and then go to the York service document for your control center to see what that message checks. This article gives you the first half of that job: the message families, the names York lists, and the parts that sit behind them.
OptiView message colors (York 160.75-EG1)
| Color | Meaning in York's guide |
|---|---|
| Green | Normal operation |
| Yellow | Warnings |
| Orange | Cycling shutdowns |
| Red | Safety shutdowns |
The color tells you which family you are in before you read a word of the message. A red message is a safety shutdown. An orange message is a cycling shutdown. The guide lists them separately, so the first question on any shutdown is which color is on the screen.
Safety shutdown messages named in the guide
York's YK Style G engineering guide, form 160.75-EG1, lists safety shutdowns that include these:
- Evaporator low pressure
- Evaporator transducer or leaving liquid probe
- Condenser high pressure contacts open
- Condenser high pressure
- Discharge high temperature
- Discharge low temperature
- Oil high temperature
- Oil low differential pressure
- Oil high differential pressure
This is a partial list. The guide names more safety shutdowns than we show here, and it keeps separate lists for fixed-speed and variable-speed drives. Confirm the exact on-screen wording on your panel. The guide is an engineering guide, not a service manual, so it names the messages without giving causes or remedies. We have not added any.
Cycling shutdown messages named in the guide
The same guide lists cycling shutdowns under the orange color. The ones we recorded include leaving chilled liquid low temperature, leaving chilled liquid flow switch open and oil low temperature differential. This is a partial list. Use the full list in York's documentation for your style and software version.
Two of the names are worth separating from the oil safety shutdowns. “Oil low temperature differential” is a cycling message, while “Oil low differential pressure” is a safety shutdown. They sound close and sit in different families. Our article on the York oil low differential pressure shutdown covers the safety message and the oil circuit parts.
What to do when a message appears
- Record the message and its color. Note the exact text, the color, and any operating values the panel shows. Do this before anyone clears the message or restarts the chiller.
- Sort it into a family. Red is a safety shutdown. Orange is a cycling shutdown. Yellow is a warning. The family decides which section of the service document you read.
- Open the York service document for your control center. York's documentation index lists 160.76-M1, titled “Service Instructions - YK Style H OptiView Control Center.” Confirm that the document matches your style and software version before you rely on it.
- Verify the reading before the part. If the message names a pressure, temperature or flow condition, compare the panel reading with an independent gauge or thermometer to separate a real condition from a bad input.
- Check the basics the message names. A flow switch message points you at chilled water flow and the switch circuit. A condenser high pressure message points you at the condenser side. Do this with the equipment locked out where you are touching wiring or opening a circuit.
- Replace only what the check points to. Confirm the part against the chiller nameplate before you order.
- Do not restart against a safety shutdown without a cause. Repeated restarts hide the information you need to find the fault.
Air-cooled screw chillers: category-level lists from distributors
Parts distributors publish troubleshooting guides for York air-cooled screw chillers that list causes by category. These are not York statements and they are category-level, so treat them as a starting checklist and confirm against York's documents. One such guide lists dirty or damaged coils, non-operating fans and an overcharged system under high discharge pressure. It lists power supply failure, wiring, defective boards and blown fuses under a unit that will not start. It lists restricted flow or broken sensors under low leaving chilled liquid, and a blown system fuse under a control voltage fault.
Notice how general those lists are. They name categories, not part numbers, and they do not tell you which board or which fuse. The York collections below list the sensors, boards and electrical parts those categories point at, by York part number.
Parts involved
| Component | Role in this issue | Where to find it |
|---|---|---|
| Evaporator pressure transducer | The “evaporator transducer or leaving liquid probe” safety shutdown names this input directly | York 025-29148-002 Transducer, Pressure (Evaporator) | OEM Chiller Part |
| Leaving liquid temperature sensor | The same message names the leaving liquid probe | York 025-40273-001 Sensor, Temperature, LWT | OEM Chiller Part |
| Other sensors and transducers | Pressure and temperature inputs behind the condenser, discharge and oil messages, including oil pressure transducers | York Chiller Sensors, Thermistors & Transducers |
| Control boards | Panel and I/O boards that read and act on those inputs | York Chiller Control Boards & OptiView Controls |
| Fuses, contactors and electrical | Power and control-circuit items behind a unit that will not start | York Chiller Fuses, Contactors & Electrical |
Scope: The message names and colors come from York 160.75-EG1, the YK Style G engineering guide. The service document named in York's documentation index, 160.76-M1, is for the YK Style H OptiView control center. Other York chiller families, including the air-cooled screw chillers in the distributor lists above, have their own controls and their own documents. The sensors and transducers above are examples we list; fitment comes from your unit's nameplate and York's parts documentation.
Before you order
Confirm your chiller's model and serial number from its nameplate before ordering, and note the style letter. Our guide to finding the correct part from the model and serial number covers the details. Search the York part number in site search, browse the York chiller parts collection or the York YK centrifugal chiller parts, and see each product page for current availability. For help confirming fit, use the contact page, email help@totalhvacparts.com with your model and serial number.
Frequently Asked Questions
What are the York OptiView safety shutdown messages?
York's YK Style G engineering guide (160.75-EG1) lists safety shutdowns that include evaporator low pressure; condenser high pressure; discharge high temperature; discharge low temperature; oil high temperature; oil low differential pressure; and oil high differential pressure. The guide's list is longer than this.
What is the difference between a York cycling shutdown and a safety shutdown?
York color-codes them: orange for cycling shutdowns, red for safety shutdowns (160.75-EG1). They are separate message families. The guide we reviewed does not give causes, so use the York service document for your control center to see what each message checks.
Does York OptiView use numeric fault codes?
In the York document we reviewed, no. OptiView shows named messages, color-coded by severity. We found no numeric OptiView code scheme, so a code list from an unrelated website is not a York source.
Why won't my York chiller start?
York's own guide gives no cause list for this. Distributor guides for air-cooled screw chillers list power supply failure, wiring, defective boards and blown fuses as categories. Read the message and color first, then work through York's service document for your unit.
Sources
- York 160.75-EG1, YK Style G Engineering Guide (OptiView Control Center section: message colors and shutdown message lists; no page numbers given)
- Johnson Controls documentation index for the YORK YK Mod H centrifugal chiller, service manuals (160.76-M1)
- Parts distributor troubleshooting guide for York air-cooled screw chillers (category-level lists; not a manufacturer document)
York chillers involve line-voltage and control-circuit electrical components, refrigerant under pressure and rotating equipment. Service should be performed only by qualified personnel, following York's installation and service documentation for your unit and your facility's lockout/tagout procedures.