Trane RTAC Fault Code C6
Trane RTAC Fault Code C6 is a warning alarm indicating: Low Chilled Water Temperature: Unit On. The most common causes include Evaporator flow too low while running. Estimated repair time: 1-2 hours. This alarm requires immediate attention by a certified HVAC technician.
Alarm Description
Low Chilled Water Temperature: Unit On
Brand: Trane | Model: RTAC (Screw Compressor Chiller) | Code: C6 | Severity: Warning
Observable Symptoms
- Controller displays alarm code and description
- Chiller may be locked out or running in degraded mode
- Alarm indicator light is illuminated on control panel
What to Check First
Before diving into detailed diagnostics, start with this quick first check:
Probable Causes
- Evaporator flow too low while running
- Expansion valve overfeeding
- Temperature sensor drift
Recommended Inspection Steps
- Verify evaporator water flow is adequate
- Check expansion valve operation and superheat
- Compare sensor to calibrated thermometer
- Adjust setpoint if load is low
Required Tools & Equipment
- Infrared thermometer or calibrated temperature probe
- PT chart for refrigerant type
- Safety PPE (gloves, safety glasses, face shield)
Estimated Repair Time
1-2 hours
When to Call a Professional
- If the fault persists after completing all recommended inspection steps
- If you observe unusual noises, vibrations, or oil leaks from the compressor
- If refrigerant charge levels are outside OEM specifications and EPA-certified recovery is needed
- If electrical measurements show voltage imbalance greater than 2% between phases
- If the fault recurs immediately after reset, indicating an unresolved safety condition
- Contact an authorized Trane service representative for warranty-covered repairs
Related Fault Codes
Other Trane RTAC codes that may be related:
OEM Service Manual Reference
OEM Reference: Trane RTAC Air-Cooled Rotary Screw Chiller Service Manual (SVR-SVN001-EN). Available through Trane Commercial support.
Frequently Asked Questions
What does Trane RTAC fault code C6 mean?
Fault code C6 on a Trane RTAC chiller indicates: Low Chilled Water Temperature: Unit On. This is a warning alarm that requires diagnostic attention.
What causes Trane RTAC alarm code C6?
Common causes include: Evaporator flow too low while running; Expansion valve overfeeding; Temperature sensor drift
How do I fix Trane RTAC error code C6?
Follow the recommended inspection steps below. Start with the quick check, then proceed through each step. If the fault persists after all steps, contact an authorized Trane service representative.