On the display
The panel reads high oil temperature (HOT). The manuals print the same message with a leading capital as well, High oil temperature (HOT), so either spelling can appear on this unit's display. The letters HOT follow the message in parentheses wherever the manuals show it.
What it means
The unit is shutting down on high oil temperature. The fault tables give this message a single meaning: the oil temperature condition is one on which the unit shuts down, and the manuals describe the unit as shutting down when the message appears. The message belongs to the machine's safety shutdowns and warnings, so it signals a protective stop of the chiller rather than a temporary notice.
Why it appears
- Incorrect lubrication, brought about by restricted oil lines, restricted oil passages, or dirty oil filters. This is the only cause the manuals give for the high oil temperature (HOT) shutdown.
What to check
- Change the oil filter element.
- Examine the oil filter element for the presence of aluminum particles. Some aluminum particles are expected on this machine:
Aluminum gas seal rings can contact the impeller and account for some aluminum particles to accumulate in the oil filter, especially during the initial start up and first several months of operation.
- If aluminum particles continue to accumulate and the same condition keeps stopping the unit operation after a new filter element is installed, notify the nearest Johnson Controls office to request the presence of a Johnson Controls Service Technician.
Questions engineers ask
What does high oil temperature (HOT) mean on a YORK YK chiller?
It means the unit is shutting down on high oil temperature. The manuals give one cause: incorrect lubrication brought about by restricted oil lines, passages, or dirty oil filters.
Why does my YORK YK keep stopping on high oil temperature?
The manual points to restricted oil lines, restricted passages, or dirty oil filters. Change the oil filter element and examine it for aluminum particles; if the same shutdown returns after a new filter element, notify the nearest Johnson Controls office.
Are aluminum particles in the YK oil filter normal?
Some are: aluminum gas seal rings can contact the impeller, and particles can gather in the oil filter, especially during initial start-up and the first several months of operation. If accumulation continues and the unit keeps shutting down after a new filter element, Johnson Controls Service should be requested.
Messages next to this one
Source
Written from the manufacturer's manuals for the YORK YK; every number and designation on this page is checked against them before publication. The row of the manual this message comes from:
All YORK YK messages: fault codes · YORK YK documentation · YORK manuals