HVAC Sales Master

Fault Code Lookup

HVAC Sales Master
ERR.185.09
System Oil Return Active
This code typically points to
  • System Oil Return function active to bring oil back to compressor
  • Low dome temperature with ON condition
Next checks to confirm
  1. Informational — oil return function active
Escalation
Not explicitly exposed
Reset behavior
Not explicitly exposed.
Informational
No action needed
Deeper detail available
The manufacturer has pushed full per-code troubleshooting trees into the Trane Technician app. Use the app for subcode detail beyond what's shown here.
Source
Trane System Alert Guide p.42, public distributor-posted PDF
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