On the display
The panel prints Oil refrigerant return not functioning. The troubleshooting guides use this single wording for the message — it is the same in the YK-CP guide with the OptiView Control Center and in the Style G, Style H and Style J guides. In the fault tables the line sits under the symptom heading stating that the oil pressure system ceases to return an oil/refrigerant sample.
What it means
The display reports that the oil return has stopped doing its job: the manual groups the message under the symptom in which the oil pressure system ceases to return an oil/refrigerant sample. The troubleshooting tables tie this display to two problems. Either the filter-drier in the oil return system is dirty, or the jet — or the orifice of that oil return jet — is clogged. Either obstruction stops the return from working, which is what the message announces on the display.
Why it appears
- The filter-drier in the oil return system is dirty.
- The jet, or the orifice of the oil return jet, is clogged.
What to check
- Inspect the filter-drier in the oil return system. If it is dirty, replace the old filter-drier with a new one.
- Remove the oil return jet and inspect it for dirt.
- Remove the dirt using solvent.
- Replace the jet.
Questions engineers ask
What does "Oil refrigerant return not functioning." mean on a YORK YK?
It is the display wording used when the oil pressure system ceases to return an oil/refrigerant sample. The troubleshooting tables tie it to a dirty filter-drier in the oil return system or to a clogged jet or orifice of the oil return jet.
How do I deal with a clogged oil return jet on a YORK YK?
Remove the jet and inspect it for dirt, remove the dirt using solvent, then replace the jet.
Does this fault require replacing the filter-drier?
When the filter-drier in the oil return system is dirty, the manual's corrective action is to replace the old filter-drier with a new one.
Is the message worded differently on other YK versions?
No. The same wording, Oil refrigerant return not functioning., appears in the YK-CP guide with the OptiView Control Center and in the Style G, Style H and Style J guides.
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